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Changing JPanel Icon when JButton is clicked

The JFrame window needs to display a random dice image. When the button is clicked, the random dice image needs to change. I have figured out how to display the random dice image, but I cannot figure out how to use the actionlistener to generate a new random dice image. I am only in my third Java class, so any guidance would be greatly appreciated!
package guiDice;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.Color;
import java.awt.Font;
import javax.swing.SwingConstants;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import java.awt.event.ActionListener;
import java.util.Random;
import java.awt.event.ActionEvent;
public class LabGuiDice extends JFrame {
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
LabGuiDice frame = new LabGuiDice();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public LabGuiDice() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JButton btnRollem = newDiceRoll();
contentPane.add(btnRollem, BorderLayout.SOUTH);
JLabel lblDice = newDiceImage();
contentPane.add(lblDice, BorderLayout.CENTER);
}
private JLabel newDiceImage() {
Random rnd = new Random();
int rand1 = 0;
rand1 = rnd.nextInt(6)+1;
JLabel lblDice = new JLabel("");
switch (rand1) {
case 1:
lblDice.setHorizontalAlignment(SwingConstants.CENTER);
lblDice.setIcon(new ImageIcon(LabGuiDice.class.getResource("/Dice/die-1.png")));
break;
case 2:
lblDice.setHorizontalAlignment(SwingConstants.CENTER);
lblDice.setIcon(new ImageIcon(LabGuiDice.class.getResource("/Dice/die-2.png")));
break;
case 3:
lblDice.setHorizontalAlignment(SwingConstants.CENTER);
lblDice.setIcon(new ImageIcon(LabGuiDice.class.getResource("/Dice/die-3.png")));
break;
case 4:
lblDice.setHorizontalAlignment(SwingConstants.CENTER);
lblDice.setIcon(new ImageIcon(LabGuiDice.class.getResource("/Dice/die-4.png")));
break;
case 5:
lblDice.setHorizontalAlignment(SwingConstants.CENTER);
lblDice.setIcon(new ImageIcon(LabGuiDice.class.getResource("/Dice/die-5.png")));
break;
case 6:
lblDice.setHorizontalAlignment(SwingConstants.CENTER);
lblDice.setIcon(new ImageIcon(LabGuiDice.class.getResource("/Dice/die-6.png")));
break;
}
return lblDice;
}
private JButton newDiceRoll() {
JButton btnRollem = new JButton("Roll 'Em");
btnRollem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
btnRollem.setBorderPainted(false);
btnRollem.setFont(new Font("Bodoni 72 Smallcaps", Font.PLAIN, 27));
btnRollem.setOpaque(true);
btnRollem.setBackground(new Color(255, 0, 0));
return btnRollem;
}
}

Create a method that generates the integer and sets the icon to the label. But in order to do that, label should be a field in the class, so all methods can access it. For example:
private void rollDice() {
Random random = new Random();
int randomInt = random.nextInt(6) + 1;
String resource = String.format("/Dice/die-%d.png", randomInt);
Icon icon = new ImageIcon(LabGuiDice.class.getResource(resource));
diceIconLabel.setIcon(icon);
}
and then:
btnRollem.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
rollDice();
}
});
with full code:
public class LabGuiDice extends JFrame {
private JPanel contentPane;
private JLabel diceIconLabel;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
LabGuiDice frame = new LabGuiDice();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public LabGuiDice() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JButton btnRollem = newDiceRoll();
contentPane.add(btnRollem, BorderLayout.SOUTH);
diceIconLabel = newDiceImage();
contentPane.add(diceIconLabel, BorderLayout.CENTER);
rollDice();
pack();
}
private void rollDice() {
Random random = new Random();
int randomInt = random.nextInt(6) + 1;
String resource = String.format("/Dice/die-%d.png", randomInt);
Icon icon = new ImageIcon(LabGuiDice.class.getResource(resource));
diceIconLabel.setIcon(icon);
}
private JLabel newDiceImage() {
JLabel lblDice = new JLabel("");
lblDice.setHorizontalAlignment(SwingConstants.CENTER);
return lblDice;
}
private JButton newDiceRoll() {
JButton btnRollem = new JButton("Roll 'Em");
btnRollem.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
rollDice();
}
});
btnRollem.setBorderPainted(false);
btnRollem.setFont(new Font("Bodoni 72 Smallcaps", Font.PLAIN, 27));
btnRollem.setOpaque(true);
btnRollem.setBackground(new Color(255, 0, 0));
return btnRollem;
}
}

Java Basic GUI (Layout Error)

So I am creating a game which contains 5x5 matrix of buttons, behind one of which is a hidden prize. I am done with the game, but I am having problems with the layout.
I have added the picture:
http://i.imgur.com/9zZ8jiV.png
The one on the left side comes up when I run the program, and when I click the button the picture on the right side comes up.
The first JFrame looks very weird I mean it occupies the whole screen length wise, so I need to pack it to just display the button in a decent size.
The second one, I need the first row to display just the label,
and then onwards each row to contain 5 buttons.
I am quite sure I am using wrong layouts but I cant figure it out how to fix it.
Below are the codes:
MyJFrame class code:
class MyJFrame extends JFrame {
JPanel panel2;
public MyJFrame() {
setLayout(new GridLayout(7, 7));
panel2 = new PanelJ2();
add(panel2);
JButton b = new JButton("Start the freaking game");
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
panel2.setVisible(true);
b.setVisible(false);
PotLuck.random = (int)(Math.random() * 25 + 1);
}
});
add(b);
setTitle( "This is a freaking game");
pack();
setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
}
PanelJ2 code:
class PanelJ2 extends JPanel {
JButton[] buttons;
JLabel label, l;
public static int count;
public PanelJ2() {
setLayout( new GridLayout(5,5) );
setPreferredSize( new Dimension( 300, 200)); //I just wrote this line, I am not sure of the purpose quite really.
count = 0;
label = new JLabel("Number of guesses so far: " + count);
add(label);
l = new JLabel("");
buttons = new JButton[25];
for( int i = 0; i <= 24; i ++) {
buttons[i] = new JButton(String.valueOf(i));
add(buttons[i]);
buttons[i].addActionListener( new ExampleActionListener1());
}
setBackground( Color.green);
setVisible(false); //this is set true when the button "Start the freaking game is pressed"
}
}

This setLayout(new GridLayout(7, 7)); is going to cause the main issue. A simpler issue would be to use a CardLayout
See How to Use CardLayout for more details
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
class MyJFrame extends JFrame {
JPanel panel2;
private CardLayout cl;
public MyJFrame() {
cl = new CardLayout();
setLayout(cl);
panel2 = new PanelJ2();
add(panel2, "LotsOfButtons");
JButton b = new JButton("Start the freaking game");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cl.show(getContentPane(), "LotsOfButtons");
}
});
add(b, "start");
cl.show(getContentPane(), "start");
setTitle("This is a freaking game");
pack();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
static class PanelJ2 extends JPanel {
JButton[] buttons;
JLabel label, l;
public static int count;
public PanelJ2() {
setLayout(new GridLayout(5, 5));
// setPreferredSize(new Dimension(300, 200)); //I just wrote this line, I am not sure of the purpose quite really.
count = 0;
label = new JLabel("Number of guesses so far: " + count);
add(label);
l = new JLabel("");
buttons = new JButton[25];
for (int i = 0; i <= 24; i++) {
buttons[i] = new JButton(String.valueOf(i));
add(buttons[i]);
// buttons[i].addActionListener(new ExampleActionListener1());
}
setBackground(Color.green);
setVisible(false); //this is set true when the button "Start the freaking game is pressed"
}
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
MyJFrame frame = new MyJFrame();
}
});
}
}
You might want to put the button into a different container, maybe using a GridBagLayout

JTextArea not show

I create an Team application in java. I add a logo which is the combination of Rectangle and Circle in JFrame but after add logo in application JTextArea not shown... Also adding new player not shown...
Here is my code.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class MainGUI extends JFrame
{
private JLabel teamName;
private JLabel playerCount;
private JLabel maxPlayer;
private JButton createTeam;
private JButton addOnePlayer;
private JButton addRemining;
private JButton exit;
private Team team;
private boolean teamCreated;
private JTextArea text;
Logo logo;
public static void main(String[] args)
{
new MainGUI();
}
public MainGUI()
{
super.setTitle("Team manager");
super.setSize(500,400);
super.setLocation(150,150);
super.setLayout(new BorderLayout());
add(addTopPanel(), BorderLayout.NORTH);
add(textArea(), BorderLayout.CENTER);
add(buttonPanel(), BorderLayout.SOUTH);
Logo logo = new Logo();
logo.setBounds(100, 100, 150,150);
getContentPane().add(logo);
// logo.addSquare(10, 10, 100, 100);
super.setVisible(true);
super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private JPanel buttonPanel()
{
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(2,2));
createTeam = new JButton("Create Team");
addOnePlayer = new JButton("Add one player");
addRemining = new JButton("Add remaining players");
exit = new JButton("Exit");
buttonPanel.add(createTeam);
buttonPanel.add(addOnePlayer);
buttonPanel.add(addRemining);
buttonPanel.add(exit);
createTeam.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
if(!teamCreated)
{
teamCreated = true;
team = new Team();
teamName.setText("Team name: "+team.getName());
playerCount.setText("Players count: "+team.getCount());
maxPlayer.setText("Max team size: "+team.getSize());
}
else
{
JOptionPane.showMessageDialog(null,"The team has been already created, and no further Team instances are instantiated");
}
}
});
addOnePlayer.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
if(team != null)
{
Player pl = Team.createPlayer();
team.addPlayer(pl);
playerCount.setText("Players count: "+team.getCount());
text.setText(team.toString());
}
else
{
JOptionPane.showMessageDialog(null,"Create a team first ");
}
}
});
addRemining.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
if(team != null)
{
team.addPlayers();
playerCount.setText("Players count: "+team.getCount());
text.setText(team.toString());
}
else
{
JOptionPane.showMessageDialog(null,"Create a team first ");
}
}
});
exit.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
System.exit(1);
}
});
return buttonPanel;
}
private JTextArea textArea()
{
text = new JTextArea();
return text;
}
private JPanel addTopPanel()
{
JPanel top = new JPanel();
top.setLayout(new GridLayout(1,3));
teamName = new JLabel("Team name: ");
playerCount = new JLabel("Players count: ");
maxPlayer = new JLabel("Max team size: ");
top.add(teamName);
top.add(playerCount);
top.add(maxPlayer);
return top;
}
class Logo extends JPanel {
/**
*
*/
private static final long serialVersionUID = 1L;
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.orange);
g.drawRect(350,80,70,70);
g.setColor(Color.blue);
g.drawRoundRect(360, 30, 50, 50, 50, 50);;
}
}
}

after add logo in application JTextArea not shown
Reason is this Line:
logo.setBounds(100, 100, 150,150);
getContentPane().add(logo);
setBounds wont work with the layouts of Swing components. So when you are adding the logo in container of JFrame it is adding it to the center , hiding out the JTextArea added in center.

Sorting Table is wrong when the sort button be pressed more than once?

I have a problem here. I create program to add data to the table and sort it when i press the button. when i press the sort button once, it isn't wrong. but when i press again it is wrong. so why? please help me.
this is the code.
Nama Class
public class Nama {
private String nama;
private int index;
public Nama(String n,int i){
nama=n;index=i;
}
void setData(String n,int i){
nama=n;index=i;
}
String nama(){
return nama;
}
int ind(){
return index;
}
public String toString(){
return(String.format("%s %d", nama,index));
}
}
MergeSort Class
import java.util.*;
public class MergeSortS{
public void merge_sort(int low,int high,Nama [] a){
int mid;
if(low<high) {
mid=(low+high)/2;
merge_sort(low,mid,a);
merge_sort(mid+1,high, a);
merge(low,mid,high,a);
}
}
public void merge(int low,int mid,int high,Nama [] a){
int h,i,j,k;
Nama b[]=new Nama[50];
h=low;
i=low;
j=mid+1;
while((h<=mid)&&(j<=high)){
if(a[h].nama().compareToIgnoreCase(a[j].nama())<0){
b[i]=a[h];
h++;
}
else{
b[i]=a[j];
j++;
}
i++;
}
if(h>mid){
for(k=j;k<=high;k++){
b[i]=a[k];
i++;
}
}
else{
for(k=h;k<=mid;k++){
b[i]=a[k];
i++;
}
}
for(k=low;k<=high;k++) a[k]=b[k];
}
public MergeSortS() {
}
}
Panel Class
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
/**
*
* #author Kareem
*/
public class Panel extends JPanel implements ActionListener{
JTable table;
JTextField tf1,tf2,tf3,tf4;
JButton b1,b2,b3,b4,b5,b6,b7;
Vector rows,columns,temp;
DefaultTableModel tabModel;
String[]data = new String[3];
String [] column = {"Nama", "Nim", "IP"};
Nama[] n,nim,ip;
MergeSortS mS;
int c=0,index=0;
public Panel(){
this.setBounds(0,0,1280, 800);
this.setLayout(null);
inaTf();
inaTab();
inaBut();
n= new Nama[50];
nim= new Nama[50];
ip= new Nama[50];
mS= new MergeSortS();
this.setVisible(true);
}
public void inaTab(){
rows=new Vector();
columns= new Vector();
temp= new Vector();
addColumns(column);
tabModel=new DefaultTableModel();
tabModel.setDataVector(rows,columns);
table = new JTable(tabModel);
table.setPreferredScrollableViewportSize(new
Dimension(500, 70));
table.setFillsViewportHeight(true);
table.setBounds(100,100,200,200);
JScrollPane scroll = new JScrollPane(table);
scroll.setBounds(50,50,400,400);
add(scroll);
}
public void inaBut(){
b1=new JButton("add Row");
b1.setBounds(50,600,90,25);
add(b1);
b1.addActionListener(this);
b2=new JButton("Delete Row");
b2.setBounds(170,600,90,25);
add(b2);
b2.addActionListener(this);
b3=new JButton("SortName");
b3.setBounds(290,600,120,25);
add(b3);
b3.addActionListener(this);
b5=new JButton("SortNim");
b5.setBounds(290,650,120,25);
add(b5);
b5.addActionListener(this);
b6=new JButton("SortIP");
b6.setBounds(290,700,120,25);
add(b6);
b6.addActionListener(this);
b4=new JButton("RESET");
b4.setBounds(170,650,90,25);
add(b4);
b4.addActionListener(this);
}
public void inaTf(){
tf1=new JTextField();
tf1.setBounds(640,50,90,25);
add(tf1);
JLabel l1= new JLabel("Nama \t: ");
l1.setBounds(530,50,90,25);
add(l1);
tf2=new JTextField();
tf2.setBounds(640,80,90,25);
add(tf2);
JLabel l2= new JLabel("Nim : ");
l2.setBounds(530,80,90,25);
add(l2);
tf3=new JTextField();
tf3.setBounds(640,110,90,25);
add(tf3);
JLabel l3= new JLabel("IPK : ");
l3.setBounds(530,110,90,25);
add(l3);
tf4=new JTextField();
tf4.setBounds(640,140,90,25);
add(tf4);
JLabel l4= new JLabel("Hapus Baris ke ");
l4.setBounds(530,140,120,25);
add(l4);
}
public void addRow()
{
Vector r;
r = createBlankElement();
rows.addElement(r);
table.addNotify();
}
public void addRow(String [] data)
{
Vector r=new Vector();
r = isi(data);
rows.addElement(r);
table.addNotify();
}
public Vector createBlankElement()
{
Vector t = new Vector();
t.addElement((String) " ");
t.addElement((String) " ");
t.addElement((String) " ");
return t;
}
public Vector isi(String[] data) {
Vector t = new Vector();
for(int j=0;j<3;j++){
t.addElement((String) data[j]);
}
return t;
}
public void addColumns(String[] colName) {
for(int i=0;i<colName.length;i++)
columns.addElement((String) colName[i]);
}
void deleteRow(int index) {
if(index!=-1) {
rows.removeElementAt(index);
table.addNotify();
}
}
#Override
public void actionPerformed(ActionEvent e) {
try{
if(e.getSource()==b1){
data[0]=tf1.getText()+" "+index;
n[index]=new Nama(data[0],index);
data[1]=tf2.getText();
nim[index]=new Nama(data[1],index);
data[2]=tf3.getText()+rows.size();
ip[index]=new Nama (data[2],index);
c=c+1;
index=index+1;
addRow(data);
}
if(e.getSource()==b2){
int i;
i=Integer.parseInt(tf4.getText());
deleteRow(i);
// for(;i<rows.size();i++){
// n[i]=n[i+1];
// }
}
if(e.getSource()==b3){
mS.merge_sort(0, rows.size()-1, n);
temp.setSize(rows.size());
for(int i=0;i<index;i++){
temp.set(i, rows.get(n[i].ind()));
}
for(int i=0;i<index;i++){
rows.set(i, temp.get(i));
}
}
if(e.getSource()==b4){
rows.setSize(0);
temp.setSize(0);
for(int i=0;i<index;i++)n[i]=null;
index=0;
}
if(e.getSource()==b5){
mS.merge_sort(0, rows.size()-1, nim);
temp.setSize(rows.size());
for(int i=0;i<rows.size();i++){
temp.set(i, rows.get(nim[i].ind()));
}
for(int i=0;i<rows.size();i++){
rows.set(i, temp.get(i));
}
}
if(e.getSource()==b6){
mS.merge_sort(0, rows.size()-1, ip);
temp.setSize(rows.size());
for(int i=0;i<rows.size();i++){
temp.add(i, rows.get(ip[i].ind()));
}
for(int i=0;i<rows.size();i++){
rows.set(i, temp.get(i));
}
}
repaint();
}
catch (Throwable t){
JOptionPane.showMessageDialog(null, "AAAAAA");
}
}
}
Frame Class
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
/**
*
* #author Kareem
*/
public class Frame extends JFrame {
public Frame(){
super("Penghitung Gaji");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLayout(null);
this.setSize(1280, 800);
this.getContentPane().add(new Panel());
this.setVisible(true);
}
public static void main(String[] args) {
Frame frame = new Frame();
}
}
Thanks. And Sorry for my bad english.

No where do you actually tell the TableModel that it's contents have changed...
Now, the thing that weirds me out, is you are keeping a Vector of the rows outside of the model...
mS.merge_sort(0, rows.size()-1, n);
temp.setSize(rows.size());
for(int i=0;i<index;i++){
temp.set(i, rows.get(n[i].ind()));
}
for(int i=0;i<index;i++){
rows.set(i, temp.get(i)); // This is doing nothing...
}
Once the data has been handed to the table model, you should not be interacting with it, unless you are willing to notify the table model of the changes.
Personally, I would simply use the inbuilt sorting capabilities of the JTable
ps- I would also, strongly, encourage you to learn how to use layout managers, they will save your sanity in the long run

Dashing through the snow
In a one-horse open sleigh
O'er the fields we go
Laughing all the way
Bells on bobtail ring'
Making spirits bright
What fun it is to ride and sing
A sleighing song tonight!
Jingle bells, jingle bells,
Jingle all the way.
Oh! what fun it is to ride
In a one-horse open sleigh.
Jingle bells, jingle bells, ....
song singing from code, please to apologize me if isn't this one your favorite song
can't comment or suggesting, excluding used LayoutManager in my code, I walked the path of least resistance, my endless lazyness
.
.
.
from code
.
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import javax.swing.RowSorter.SortKey;
import javax.swing.ScrollPaneConstants;
import javax.swing.SortOrder;
import javax.swing.SwingConstants;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableRowSorter;
public class MyFrame {
private JFrame frame = new JFrame();
private JTable table;
private JPanel buttonPanel = new JPanel();
private JPanel buttonPanelSouth = new JPanel();
private JPanel textFieldPanel = new JPanel();
private JPanel northPanel = new JPanel();
private JPanel centerPanel = new JPanel();
private JLabel l1, l2, l3, l4;
private JTextField tf1, tf2, tf3, tf4;
private JButton b1, b2, b3, b4, b5, b6, b7;
private String[] columnNames = {"Nama", "Nim", "IP", "Hapus Baris ke"};
private Object[][] data = {
{"igor", "B01_125-358", "1.124.01.125", true},
{"lenka", "B21_002-242", "21.124.01.002", true},
{"peter", "B99_001-358", "99.124.01.001", false},
{"zuza", "B12_100-242", "12.124.01.100", true},
{"jozo", "BUS_011-358", "99.124.01.011", false},
{"nora", "B09_154-358", "9.124.01.154", false},
{"xantipa", "B01_001-358", "1.124.01.001", false},};
private DefaultTableModel model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
#Override
public boolean isCellEditable(int row, int column) {
switch (column) {
case 3:
return true;
default:
return false;
}
}
#Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
public MyFrame() {
table = new JTable(model);
table.setAutoCreateRowSorter(true);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
table.setFillsViewportHeight(true);
table.getSelectionModel().setSelectionMode(
ListSelectionModel.SINGLE_SELECTION);
DefaultTableCellRenderer stringRenderer =
(DefaultTableCellRenderer) table.getDefaultRenderer(String.class);
stringRenderer.setHorizontalAlignment(SwingConstants.CENTER);
JScrollPane pane = new JScrollPane(table,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
centerPanel.setLayout(new BorderLayout(10, 10));
centerPanel.setBorder(new EmptyBorder(10, 10, 10, 10));
centerPanel.add(pane);
centerPanel.add(pane);
//
b1 = new JButton("add Row");
b1.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
model.addRow(new Object[]{(tf1.getText()).trim(),
(tf2.getText()).trim(), (tf3.getText()).trim(), true});
}
});
b2 = new JButton("Delete Row");
b2.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
int rowToDelete = 0;
int rowToModel = 0;
if (table.getSelectedRow() > -1) {
rowToDelete = table.getSelectedRow();
rowToModel = table.convertRowIndexToModel(rowToDelete);
model.removeRow(rowToModel);
}
}
});
b3 = new JButton("RESET");
b3.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
table.getRowSorter().setSortKeys(null);
}
});
b4 = new JButton("SortName");
b4.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
table.getRowSorter().toggleSortOrder(0);
}
});
b5 = new JButton("SortNim");
b5.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
TableRowSorter rowSorter = (TableRowSorter) table.getRowSorter();
List<SortKey> sortKeys = new ArrayList<SortKey>();
SortKey sortKey = new SortKey(1, SortOrder.ASCENDING);
sortKeys.add(sortKey);
rowSorter.setSortKeys(sortKeys);
rowSorter.sort();
}
});
b6 = new JButton("SortIP");
b6.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
TableRowSorter rowSorter = (TableRowSorter) table.getRowSorter();
List<SortKey> sortKeys = new ArrayList<SortKey>();
SortKey sortKey = new SortKey(2, SortOrder.DESCENDING);
sortKeys.add(sortKey);
SortKey sortKey1 = new SortKey(1, SortOrder.ASCENDING);
sortKeys.add(sortKey1);
SortKey sortKey2 = new SortKey(0, SortOrder.UNSORTED);
sortKeys.add(sortKey2);
rowSorter.setSortKeys(sortKeys);
rowSorter.sort();
}
});
b7 = new JButton("SortIP");
buttonPanel.setLayout(new GridLayout(1, 0, 50, 0));
buttonPanel.setBorder(new EmptyBorder(2, 10, 2, 10));
buttonPanel.add(b1);
buttonPanel.add(b2);
//
buttonPanelSouth.setLayout(new GridLayout(1, 4, 5, 5));
buttonPanelSouth.add(b3);
buttonPanelSouth.add(b7);
b7.setVisible(false);
buttonPanelSouth.add(b4);
buttonPanelSouth.add(b5);
buttonPanelSouth.add(b6);
centerPanel.add(buttonPanelSouth, BorderLayout.SOUTH);
//
l1 = new JLabel("Nama : ", JLabel.RIGHT);
tf1 = new JTextField();
l2 = new JLabel("Nim : ", JLabel.RIGHT);
tf2 = new JTextField();
l3 = new JLabel("IPK : ", JLabel.RIGHT);
tf3 = new JTextField();
l4 = new JLabel("Hapus Baris ke :", JLabel.RIGHT);
tf4 = new JTextField();
textFieldPanel.setLayout(new GridLayout(4, 2, 10, 10));
textFieldPanel.setBorder(new EmptyBorder(10, 10, 10, 10));
textFieldPanel.add(l1);
textFieldPanel.add(tf1);
textFieldPanel.add(l2);
textFieldPanel.add(tf2);
textFieldPanel.add(l3);
textFieldPanel.add(tf3);
textFieldPanel.add(l4);
textFieldPanel.add(tf4);
//
northPanel.setLayout(new BorderLayout());
northPanel.add(textFieldPanel);
northPanel.add(buttonPanel, BorderLayout.SOUTH);
//
frame.add(northPanel, BorderLayout.NORTH);
frame.add(centerPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] arg) {
java.awt.EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
MyFrame myFrame = new MyFrame();
}
});
}
}

JLabel alignment issues

So, I have a problem. I have a JPanel(BoxLayout, Y_AXIS). In it, I have JLabel, and JTextArea. JTextArea expands freely as I fill it with text, expanding the JPanel with it.
JLabel expands to. That is okay as long the text is vertically aligned to the top. But that command doesn't work for some reason (setVerticalTextPosition, setVerticalAlignment, setAlignmentX). I think the first one is acctually a bug within Java.
Since that didn't work, I tried glueing JLabel to the top border.
I have also set all three setXXSize to sam value to keep the size of JLabel constant.
But it just wont stick, depending on the layout it either snaps to the center or just fills the whole JPanel.
Now, I don't care how, but all I need is a couple of letters that are top-aligned in the space occupied with JLabel (I can even use another JTextComponent, if it will make any difference). Is there a way to do that?
I'd provide you with code, but it's pretty much what I have written above, and since the JPanel is a part of more complex GUI, I'd really have to give you the whole code...
(Which I will, if it will be needed.)
package core;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Locale;
import java.util.Properties;
import java.util.ResourceBundle;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.border.Border;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
#SuppressWarnings("serial")
class DefaultFont extends Font
{
public DefaultFont()
{
super("Arial", PLAIN, 20);
}
}
#SuppressWarnings("serial")
class Page extends JPanel
{
public JPanel largePage;
public int content;
public Page(JPanel panel, int index)
{
largePage = new JPanel();
largePage.setLayout(new BoxLayout(largePage, BoxLayout.Y_AXIS));
largePage.setMaximumSize(new Dimension(794, 1123));
largePage.setPreferredSize(new Dimension(794, 1123));
largePage.setAlignmentX(Component.CENTER_ALIGNMENT);
largePage.setBackground(Color.WHITE);
largePage.add(new Box.Filler(new Dimension(0, 96), new Dimension(0, 96), new Dimension(0, 96)));
setMaximumSize(new Dimension(556, 931));
setBackground(Color.LIGHT_GRAY);
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
add(new Box.Filler(new Dimension(556, 0), new Dimension(556, 931), new Dimension(556, 931)));
largePage.add(this);
largePage.add(new Box.Filler(new Dimension(0, 96), new Dimension(0, 96), new Dimension(0, 96)));
panel.add(largePage, index);
panel.add(new Box.Filler(new Dimension(0, 40), new Dimension(0, 40), new Dimension(0, 40)));
content = 0;
Main.pages.add(this);
}
}
#SuppressWarnings("serial")
class Heading extends JTextArea
{
public boolean type;
public AbstractDocument doc;
public ArrayList<JPanel/*Question*/> questions;
public ArrayList<JPanel/*List*/> list;
public Heading(boolean segment, Page page)
{
type = segment;
setBackground(Color.RED);
setFont(new Font("Arial", Font.BOLD, 20));
Border in = BorderFactory.createDashedBorder(Color.BLACK);
Border out = BorderFactory.createMatteBorder(0, 0, 10, 0, Color.WHITE);
setBorder(BorderFactory.createCompoundBorder(out, in));
setLineWrap(true);
setWrapStyleWord(true);
setText("Heading 1 Heading 1 Heading 1 Heading 1");
doc = (AbstractDocument)this.getDocument();
doc.setDocumentFilter(new DocumentFilter()
{
public void insertString(FilterBypass fb, int offs,String str, AttributeSet a) throws BadLocationException
{
if ((fb.getDocument().getLength() + str.length()) <= 150)
{
;
fb.insertString(offs, str.replaceAll("\n", " "), a);
}
else
{
int spaceLeft = 150 - fb.getDocument().getLength();
if (spaceLeft <= 0)
return;
fb.insertString(offs, str.substring(0,spaceLeft).replaceAll("\n", " "), a);
}
}
public void replace(FilterBypass fb, int offs, int length, String str, AttributeSet a) throws BadLocationException
{
if (str.equals("\n"))
{
str = "";
}
if ((fb.getDocument().getLength() + str.length() - length) <= 150)
{
fb.replace(offs, length, str.replaceAll("\n", " "), a);
}
else
{
int spaceLeft = 150 - fb.getDocument().getLength() + length;
if (spaceLeft <= 0)
return;
fb.replace(offs, length, str.substring(0,spaceLeft).replaceAll("\n", " "), a);
}
}
});
page.add(this, 0);
page.content++;
if (type)
{
questions = new ArrayList<JPanel>();
}
else
{
list = new ArrayList<JPanel>();
}
}
}
#SuppressWarnings("serial")
class Question extends JPanel
{
public JPanel questionArea, numberArea, answerArea;
public JLabel number;
public JTextArea question;
public Question(Page page, int pageNum, int index)
{
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
questionArea = new JPanel();
questionArea.setLayout(new BoxLayout(questionArea, BoxLayout.X_AXIS));
numberArea = new JPanel();
numberArea.setLayout(new BoxLayout(numberArea, BoxLayout.Y_AXIS));
numberArea.setBackground(Color.YELLOW);
number = new JLabel(pageNum+".", JLabel.RIGHT);
number.setMinimumSize(new Dimension(100, 20));
number.setPreferredSize(new Dimension(100, 20));
number.setMaximumSize(new Dimension(100, 20));
//number.setAlignmentX(TOP_ALIGNMENT);
number.setFont(new Font("Arial", Font.PLAIN, 18));
number.setBackground(Color.BLUE);
numberArea.add(number);
//numberArea.add(new Box.Filler(new Dimension(40, 0), new Dimension(40, 30), new Dimension(40, 300)), BorderLayout.CENTER);
questionArea.add(numberArea);
question = new JTextArea();
question.setFont(new Font("Arial", Font.PLAIN, 18));
question.setLineWrap(true);
question.setWrapStyleWord(true);
question.setBackground(Color.GREEN);
question.setText("dafd afdfd fasdfsdaah fg dfgd");
questionArea.add(question);
add(questionArea);
page.add(this, index);
}
}
public class Main
{
public static Properties config;
public static Locale currentLocale;
public static ResourceBundle lang;
public static JFrame mWindow;
public static JMenuBar menu;
public static JMenu menuFile, menuEdit;
public static JMenuItem itmNew, itmClose, itmLoad, itmSave, itmSaveAs, itmExit, itmCut, itmCopy, itmPaste, itmProperties;
public static JDialog newDoc;
public static JLabel newDocText1, newDocText2;
public static JRadioButton questions, list;
public static ButtonGroup newDocButtons;
public static JButton newDocOk;
public static Boolean firstSegment;
public static JPanel workspace;
public static JScrollPane scroll;
public static ArrayList<Page> pages;
public static void newDocumentForm()
{
//new document dialog
mWindow.setEnabled(false);
newDoc = new JDialog(mWindow, "newDoc");
newDoc.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
newDoc.addWindowListener(new WindowListener ()
{
public void windowActivated(WindowEvent arg0) {}
public void windowClosing(WindowEvent arg0)
{
mWindow.toFront();
newDocText1 = null;
newDocText2 = null;
questions = null;
list = null;
newDocButtons = null;
newDocOk = null;
newDoc.dispose();
mWindow.setEnabled(true);
}
public void windowClosed(WindowEvent arg0) {}
public void windowDeactivated(WindowEvent arg0) {}
public void windowDeiconified(WindowEvent arg0) {}
public void windowIconified(WindowEvent arg0) {}
public void windowOpened(WindowEvent arg0) {}
});
newDoc.setSize(400, 200);
newDoc.setLocationRelativeTo(null);
newDoc.setResizable(false);
newDoc.setLayout(null);
newDoc.setVisible(true);
newDocText1 = new JLabel("newDocText1");
newDocText1.setBounds(5, 0, 400, 20);
newDocText2 = new JLabel("newDocText2");
newDocText2.setBounds(5, 20, 400, 20);
newDoc.add(newDocText1);
newDoc.add(newDocText2);
firstSegment = true;
questions = new JRadioButton("questions");
questions.setSelected(true);
questions.setFocusPainted(false);
questions.setBounds(10, 60, 400, 20);
questions.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
firstSegment = true;
}
});
list = new JRadioButton("list");
list.setFocusPainted(false);
list.setBounds(10, 80, 400, 20);
list.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
firstSegment = false;
}
});
newDoc.add(questions);
newDoc.add(list);
newDocButtons = new ButtonGroup();
newDocButtons.add(questions);
newDocButtons.add(list);
newDocOk = new JButton("ok");
newDocOk.addKeyListener(new KeyListener()
{
public void keyPressed(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
newDocOk.doClick();
}
}
public void keyReleased(KeyEvent e) {}
public void keyTyped(KeyEvent e) {}
});
newDocOk.setFocusPainted(false);
newDocOk.setBounds(160, 120, 80, 40);
newDocOk.setMnemonic(KeyEvent.VK_ACCEPT);
newDocOk.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
createNewDocument();
}
});
newDoc.add(newDocOk);
newDocOk.requestFocus();
}
public static void createNewDocument()
{
//dispose of new document dialog
mWindow.toFront();
newDocText1 = null;
newDocText2 = null;
questions = null;
list = null;
newDocButtons = null;
newDocOk = null;
newDoc.dispose();
mWindow.setEnabled(true);
//create document display
workspace = new JPanel();
workspace.setLayout(new BoxLayout(workspace, BoxLayout.PAGE_AXIS));
workspace.add(new Box.Filler(new Dimension(0, 40), new Dimension(0, 40), new Dimension(0, 40)));
workspace.setBackground(Color.BLACK);
scroll = new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scroll.getVerticalScrollBar().setUnitIncrement(20);
scroll.setViewportView(workspace);
pages = new ArrayList<Page>();
#SuppressWarnings("unused")
Page p = new Page(workspace, 1);
Heading g = new Heading(true, p);
Question q = new Question(p, 1, 1);
mWindow.add(scroll, BorderLayout.CENTER);
mWindow.repaint();
mWindow.validate();
}
public static void main(String[] args) throws FileNotFoundException, IOException
{
//create main window
mWindow = new JFrame("title");
mWindow.setSize(1000, 800);
mWindow.setMinimumSize(new Dimension(1000, 800));
mWindow.setLocationRelativeTo(null);
mWindow.setLayout(new BorderLayout());
mWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mWindow.setVisible(true);
//create menu bar
menu = new JMenuBar();
menuFile = new JMenu("file");
menuEdit = new JMenu("edit");
itmNew = new JMenuItem("new");
itmNew.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, ActionEvent.CTRL_MASK));
itmNew.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
newDocumentForm();
}
});
itmClose = new JMenuItem("close");
itmClose.setActionCommand("Close");
itmClose.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, ActionEvent.CTRL_MASK));
itmLoad = new JMenuItem("load");
itmLoad.setActionCommand("Load");
itmLoad.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_L, ActionEvent.CTRL_MASK));
itmSave = new JMenuItem("save");
itmSave.setActionCommand("Save");
itmSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.CTRL_MASK));
itmSaveAs = new JMenuItem("saveAs");
itmSaveAs.setActionCommand("SaveAs");
itmExit = new JMenuItem("exit");
itmExit.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
//Add confirmation window!
System.exit(0);
}
});
itmCut = new JMenuItem("cut");
itmCut.setActionCommand("Cut");
itmCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK));
itmCopy = new JMenuItem("copy");
itmCopy.setActionCommand("Copy");
itmCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.CTRL_MASK));
itmPaste = new JMenuItem("paste");
itmPaste.setActionCommand("Paste");
itmPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, ActionEvent.CTRL_MASK));
itmProperties = new JMenuItem("properties");
itmProperties.setActionCommand("properties");
itmProperties.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P, ActionEvent.CTRL_MASK));
menuFile.add(itmNew);
menuFile.add(itmClose);
menuFile.addSeparator();
menuFile.add(itmLoad);
menuFile.addSeparator();
menuFile.add(itmSave);
menuFile.add(itmSaveAs);
menuFile.addSeparator();
menuFile.add(itmExit);
menuEdit.add(itmCut);
menuEdit.add(itmCopy);
menuEdit.add(itmPaste);
menuEdit.addSeparator();
menuEdit.add(itmProperties);
menu.add(menuFile);
menu.add(menuEdit);
//create actionListener for menus
mWindow.add(menu, BorderLayout.NORTH);
mWindow.repaint();
mWindow.validate();
}
}
This is the best I can do, refer to Question class for issue.
To get GUI drawn, run it, pres ctrl+n, and then enter.

As I understood you want to achieve this:
If that is true, all you have to do is this:
numberArea.setLayout(new BorderLayout());
and
numberArea.add(number,BorderLayout.NORTH);

As brano88 suggests, change layout manager...
public Question(Page page, int pageNum, int index) {
setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
questionArea = new JPanel();
questionArea.setLayout(new GridBagLayout());
numberArea = new JPanel();
numberArea.setLayout(new BoxLayout(numberArea, BoxLayout.Y_AXIS));
numberArea.setBackground(Color.YELLOW);
number = new JLabel(pageNum + ".", JLabel.RIGHT);
number.setMinimumSize(new Dimension(100, 20));
number.setPreferredSize(new Dimension(100, 20));
number.setMaximumSize(new Dimension(100, 20));
//number.setAlignmentX(TOP_ALIGNMENT);
number.setFont(new Font("Arial", Font.PLAIN, 18));
number.setBackground(Color.BLUE);
numberArea.add(number);
//numberArea.add(new Box.Filler(new Dimension(40, 0), new Dimension(40, 30), new Dimension(40, 300)), BorderLayout.CENTER);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.anchor = GridBagConstraints.NORTH;
questionArea.add(numberArea, gbc);
question = new JTextArea();
question.setFont(new Font("Arial", Font.PLAIN, 18));
question.setLineWrap(true);
question.setWrapStyleWord(true);
question.setBackground(Color.GREEN);
question.setText("dafd afdfd fasdfsdaah fg dfgd");
gbc.gridx = 1;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 1;
gbc.weighty = 1;
gbc.anchor = GridBagConstraints.NORTH;
questionArea.add(question, gbc);
add(questionArea);
page.add(this, index);
}