JScrollPane in Jlist - java

hello goodevening to all i have a problem on my program with the ScrollPane in my JList i cant put an JScrollPane in my list because i am using a panel instead of Container this is my code so far its all runnable the problem is if you enter a high number in the number of times the some output will not be able to see because of the size of my list . so this is the code
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MultCen extends JFrame implements ActionListener
{
public static void main(String args [])
{
MultCen e = new MultCen();
e.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
e.setVisible(true);
e.setSize(300,450);
}
JTextField t1 = new JTextField();
JTextField t2 = new JTextField();
JButton b = new JButton("Okay");
JButton c = new JButton("Clear");
JList list = new JList();
JLabel lab = new JLabel();
DefaultListModel m = new DefaultListModel();
public MultCen()
{
JPanel panel = new JPanel();
panel.setLayout(null);
JLabel l = new JLabel("Enter a number :");
JLabel l1 = new JLabel("How many times :");
l.setBounds(10,10,130,30);
l1.setBounds(10,40,130,30);
t1.setBounds(140,10,130,25);
t2.setBounds(140,40,130,25);
b.setBounds(60,90,75,30);
c.setBounds(150,90,75,30);
list.setBounds(30,140,220,220);
panel.add(t1);
panel.add(t2);
panel.add(l);
panel.add(l1);
panel.add(list);
panel.add(b);
panel.add(c);
getContentPane().add(panel);
b.addActionListener(this);
c.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == b)
{
int t3 = Integer.parseInt(t1.getText());
int t4 = Integer.parseInt(t2.getText());
m.addElement("The multiplication Table of "+t3);
for (int cc =1 ; cc <=t4; cc++ )
{
lab.setText(t3+"*"+cc+" = "+(t3*cc));
m.addElement(lab.getText());
list.setModel(m);
}
}
if(e.getSource() == c)
{
t1.setText("");
t2.setText("");
m.removeAllElements();
}
}
}

JScrollPane does not work with null Layout. Use BoxLayout or any other resizeable layout instead. This is the limitation of setLayout(null).

Use Layout managers. You've asked a lot of questions here and I'm sure a few you have been advised not to use null layout. Again here is the tutorial Laying out components Within a container. Learn to use them so you don't run into the million possible problems on the road ahead. This kind of problem being one of them.
here's an example of how you could achieve the same thing with layout managers, and some empty borders for white space.
With Layout Manager
Without Layout Manger
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class MultCen extends JFrame {
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
MultCen e = new MultCen();
e.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
e.setVisible(true);
e.pack();
}
});
}
JTextField t1 = new JTextField(10);
JTextField t2 = new JTextField(10);
JButton b = new JButton("Okay");
JButton c = new JButton("Clear");
JLabel lab = new JLabel();
DefaultListModel m = new DefaultListModel();
public MultCen() {
JPanel topPanel = new JPanel(new GridLayout(2, 2, 0, 5));
JLabel l = new JLabel("Enter a number :");
JLabel l1 = new JLabel("How many times :");
topPanel.add(l);
topPanel.add(t1);
topPanel.add(l1);
topPanel.add(t2);
JPanel buttonPanel = new JPanel();
buttonPanel.add(b);
buttonPanel.add(c);
buttonPanel.setBorder(new EmptyBorder(10, 0, 10, 0));
JList list = new JList();
JScrollPane scroll = new JScrollPane(list);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scroll.setPreferredSize(new Dimension(300, 300));
JPanel panel = new JPanel(new BorderLayout());
panel.add(topPanel, BorderLayout.NORTH);
panel.add(buttonPanel, BorderLayout.CENTER);
panel.add(scroll, BorderLayout.SOUTH);
panel.setBorder(new EmptyBorder(10, 15, 10, 15));
getContentPane().add(panel);
}
}
Side Notes
Run Swing apps from the Event Dispatch Thread. See Initial Threads
When you do decide to use layout managers, just pack() your frame instead of setSize()
Use better variable names.
See Extends JFrame vs. creating it inside the the program

Related

Place label for text box above the box and not to the side

As stated in the title i need to move the label for the text box to be above the box and not to the side. attached i have a picutres of what i mean. what i have vs what i want i have tried searching for it but i cannot seem to find the answer im looking for/not exactly sure what to look up. I have tried using JFrame but it made a separate window unless i need to make the entire GUI a JFrame for me to get the result i want?
Also the actionPerformed method has things but it is irrelevant to the question but displays correctly still.
import java.awt.event.\*;
import javax.swing.\*;
import java.text.DecimalFormat;
public class Project4 extends JFrame implements ActionListener {
private JTextArea taArea = new JTextArea("", 30, 20);
ButtonGroup group = new ButtonGroup();
JTextField name = new JTextField(20);
boolean ch = false;
boolean pep = false;
boolean sup = false;
boolean veg = false;
DecimalFormat df = new DecimalFormat("##.00");
double cost = 0.0;
public Project4() {
initUI();
}
public final void initUI() {
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
JPanel panel4 = new JPanel();
JPanel panel5 = new JPanel();
getContentPane().add(panel1, "North");
getContentPane().add(panel2, "West");
getContentPane().add(panel3, "Center");
getContentPane().add(panel4, "East");
panel4.setLayout(new BoxLayout(panel4, BoxLayout.Y_AXIS));
getContentPane().add(panel5, "South");
JButton button = new JButton("Place Order");
button.addActionListener(this);
panel5.add(button);
JButton button2 = new JButton("Clear");
button2.addActionListener(this);
panel5.add(button2);
panel3.add(taArea);
JCheckBox checkBox1 = new JCheckBox("Cheese Pizza") ;
checkBox1.addActionListener(this);
panel4.add(checkBox1);
JCheckBox checkBox2 = new JCheckBox("Pepperoni Pizza");
checkBox2.addActionListener(this);
panel4.add(checkBox2);
JCheckBox checkBox3 = new JCheckBox("Supreme Pizza");
checkBox3.addActionListener(this);
panel4.add(checkBox3);
JCheckBox checkBox4 = new JCheckBox("Vegetarian Pizza");
checkBox4.addActionListener(this);
panel4.add(checkBox4);
JRadioButton radioButton1 = new JRadioButton("Pick Up");
group.add(radioButton1);
radioButton1.addActionListener(this);
panel1.add(radioButton1);
JRadioButton radioButton2 = new JRadioButton("Delivery");
group.add(radioButton2);
radioButton2.addActionListener(this);
panel1.add(radioButton2);
JLabel name_label = new JLabel("Name on Order");
name.addActionListener(this);
panel5.add(name_label);
panel5.add(name);
setSize(600, 300);
setTitle("Pizza to Order");
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent action) {
}
public static void main(String[] args) {
Project4 ex = new Project4();
ex.setVisible(true);
}
}
You can use a nested JPanel with another layout in order to achieve that. I would go with BorderLayout here. You can also other layouts that allow vertical orientation. Visiting the visual guide to Layout Managers will help you spot them.
JLabel name_label = new JLabel("Name on Order");
name.addActionListener(this);
JPanel verticalNestedPanel = new JPanel(new BorderLayout());
verticalNestedPanel.add(name_label, BorderLayout.PAGE_START);
verticalNestedPanel.add(name, BorderLayout.PAGE_END);
panel5.add(verticalNestedPanel);

CardLayout tabs overlapping

I have this very simple code of CardLayout example. The problem is that when I put in different cards elements such as JTextFields or JTextAreas, when running Java example those elements overlay on the first card (see screenshot).
When I click switch button, to switch between tabs, the problem disappears (each element is on the card it is supposed to be), but when I run the code for the first time all or some (or none, sometimes it shows it properly) of the JTextField/Areas overlap on the front view. Can anyone explain it to me what am I doing wrong?
Here is the code:
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class temporary{
CardLayout cards = new CardLayout();
JPanel topPanel = new JPanel();
JPanel bottomPanel = new JPanel();
JButton switchButton = new JButton("Switch!");
temporary(){
JFrame ramka = new JFrame("CardLayout Example");
topPanel.add(switchButton);
ListenForButton lForButton = new ListenForButton();
switchButton.addActionListener(lForButton);
//panel1
JPanel panel1 = new JPanel();
JTextField text1 = new JTextField("TextExample1", 50);
JTextField text2 = new JTextField(50);
panel1.add(text1);
panel1.add(text2);
//panel2
JPanel panel2 = new JPanel();
JTextField text3 = new JTextField("TextExample2",40);
panel2.add(text3);
//panel3
JPanel panel3 = new JPanel();
JTextField text4 = new JTextField("TextExample3", 20);
panel3.add(text4);
panel1.setBackground(Color.white);
panel2.setBackground(Color.lightGray);
panel3.setBackground(Color.gray);
bottomPanel.add(panel1);
bottomPanel.add(panel2);
bottomPanel.add(panel3);
bottomPanel.setLayout(cards);
cards.show(bottomPanel, "CardLayout");
ramka.getContentPane().add(topPanel, BorderLayout.NORTH);
ramka.getContentPane().add(bottomPanel, BorderLayout.CENTER);
ramka.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ramka.setSize(1200, 700);
ramka.setLocationRelativeTo(null);
ramka.setVisible(true);
}
public static void main(String[] args){
new temporary();
}
public class ListenForButton implements ActionListener{
public void actionPerformed(ActionEvent e){
cards.next(bottomPanel);
}
}
}

why SyntheticaClassyLookAndFeel showing layer over transparent panels

import java.awt.*;
import de.javasoft.plaf.synthetica.SyntheticaClassyLookAndFeel;
import javax.swing.*;
public class TB extends JFrame
{
{
try
{
UIManager.setLookAndFeel(new SyntheticaClassyLookAndFeel());
}
catch (Exception e)
{
e.printStackTrace();
}}
TB() throws ClassNotFoundException
{
frame1();
}
public void frame1()
{
JPanel p = new JPanel();
p.setLayout(new FlowLayout());
p.setBackground(new Color(0,0,0,100));
JPanel p1 = new JPanel();
p1.setBackground(new Color(0,0,0,100));
JLabel jl = new JLabel("");
setContentPane(new JLabel(new ImageIcon("src\\ New folder\\1.jpg")));
p1.add(jl);
p1.setVisible(true);
p1.setSize(200,150);
add(p1);
JPanel p2 = new JPanel();
p2.setLayout(new FlowLayout());
p2.setSize(200,100);
p2.setBackground(new Color(0,0,0,125));
JButton hm = new JButton ("Home");
JButton abt = new JButton("AboutUs");
JButton log = new JButton("SignIn");
p2.add(hm);
p2.add(abt);
p2.add(log);
add(p2);
add(p);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(3,1,0,0));
p3.setBackground(new Color(0,0,0,100));
JLabel usr = new JLabel("Username :");
usr.setForeground(Color.white);
JTextField usrtxt = new JTextField();
Component pass = new JLabel("Password :");
pass.setForeground(Color.white);
JPasswordField passtxt = new JPasswordField(20);
JButton login = new JButton("Login");
JButton cancel = new JButton("Clear");
p3.add(usr);
p3.add(usrtxt);
p3.add(pass);
p3.add(passtxt);
p3.add(login);
p3.add(cancel);
p.add(p3);
p3.setVisible(false);
setTitle(" Generator 1.0");
setLayout(new GridLayout(3,1,0,0));
setSize(1364,700);
setVisible(true);
JPanel p4 = new JPanel();
p4.setBackground(new Color(0,0,0,100));
JLabel msg = new JLabel("About Us",JLabel.CENTER);
msg.setForeground(Color.white);
p4.setLayout(new GridLayout(5,1));
p4.add(msg,JLabel.CENTER_ALIGNMENT);
p.add(p4);
p4.setVisible(false);
}
public static void main(String[]args) throws ClassNotFoundException
{
TB TTV = new TB( );
new TB();
TTV.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}
This new Color(0,0,0,100) isn't how you to transparency in Swing. Swing only deals with fully transparent or opaque components. In this case, specifying a alpha based color, the painting process doesn't know that it should be painting beneath the component, leading to all sorts of weird painting atrificates.
If you want transparency, then you need to fake it, but making the component completely transparent (setOpaque(false)) and overriding the component's paintComponent method and filling the component area with the translucent color you want
Something like this and this for example

My GUI window doesn't show anything

I'm trying to use a grid layout to make a GUI window. I add all my components and it compiles but when it runs it doesn't show anything. I'm trying to make a simple layout grouped and stacked like this.
{introduction message}
{time label
time input text}
{gravity label
gravity input text}
{answer label
answer text box}
{calculate button clear button}
Here is my code
import javax.swing.*;
import java.awt.*;
public class TurnerRandyFallingGUI extends JFrame
{
final int WINDOW_HEIGHT=500;
final int WINDOW_WIDTH=500;
public TurnerRandyFallingGUI()
{
setTitle("Falling Distance Calculator");
setSize(WINDOW_WIDTH,WINDOW_HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new GridLayout(1, 5));
//labels
JLabel introMessage = new JLabel("Welcome to the Falling distance"+
"calculator");
JLabel timeLabel = new JLabel("Please enter the amount of time "+
"in seconds the object was falling.");
JLabel gravityLabel = new JLabel("Enter the amount of gravity being "+
"forced onto the object");
JLabel answerLabel = new JLabel("Answer");
//text fields
JTextField fTime = new JTextField(10);
JTextField gForce = new JTextField(10);
JTextField answerT = new JTextField(10);
//buttons
JButton calculate = new JButton("Calculate");
JButton clr = new JButton("clear");
//panels
JPanel introP = new JPanel();
JPanel timeP = new JPanel();
JPanel gravityP = new JPanel();
JPanel answerP = new JPanel();
JPanel buttonsP = new JPanel();
//adding to the panels
//intro panel
introP.add(introMessage);
//time panel
timeP.add(timeLabel);
timeP.add(fTime);
//gravity panel
gravityP.add(gravityLabel);
gravityP.add(gForce);
//answer panel
answerP.add(answerLabel);
answerP.add(answerT);
//button panel
buttonsP.add(calculate);
buttonsP.add(clr);
setVisible(true);
}
public static void main(String[] args)
{
new TurnerRandyFallingGUI();
}
}
You've added nothing to the JFrame that your class above extends. You need to add your components to containers whose hierarchy eventually leads to the top level window, to the this if you will. In other words, you have no add(someComponent) or the functionally similar this.add(someComponent)method call in your code above.
Consider adding all of your JPanels to a single JPanel
Consider adding that JPanel to the JFrame instance that is your class by calling add(thatJPanel).
Even better would be to not extend JFrame and just to create one when needed, but that will likely be the subject of another discussion at another time.
Before setVisible (true) statement add following statements:
add (introP);
add (timeP);
add (gravityP);
add (answerP);
add (buttonsP);
There is nothing in your JFrame. That is the reason
import javax.swing.*;
import java.awt.*;
public class TurnerRandyFallingGUI extends JFrame
{
final int WINDOW_HEIGHT=500;
final int WINDOW_WIDTH=500;
public TurnerRandyFallingGUI()
{
//labels
JLabel introMessage = new JLabel("Welcome to the Falling distance"+
"calculator");
JLabel timeLabel = new JLabel("Please enter the amount of time "+
"in seconds the object was falling.");
JLabel gravityLabel = new JLabel("Enter the amount of gravity being "+
"forced onto the object");
JLabel answerLabel = new JLabel("Answer");
//text fields
JTextField fTime = new JTextField(10);
JTextField gForce = new JTextField(10);
JTextField answerT = new JTextField(10);
//buttons
JButton calculate = new JButton("Calculate");
JButton clr = new JButton("clear");
//panels
JPanel introP = new JPanel();
JPanel timeP = new JPanel();
JPanel gravityP = new JPanel();
JPanel answerP = new JPanel();
JPanel buttonsP = new JPanel();
//adding to the panels
//intro panel
introP.add(introMessage);
//time panel
timeP.add(timeLabel);
timeP.add(fTime);
//gravity panel
gravityP.add(gravityLabel);
gravityP.add(gForce);
//answer panel
answerP.add(answerLabel);
answerP.add(answerT);
//button panel
buttonsP.add(calculate);
buttonsP.add(clr);
setLayout(new GridLayout(5, 1));
this.add(introP);
this.add(timeP);
this.add(gravityP);
this.add(answerP);
this.add(buttonsP);
setTitle("Falling Distance Calculator");
this.pack();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
this.validate();
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new TurnerRandyFallingGUI();
}
});
}
}
Consider the following
In GridLayout, the first parameter is Rows, Second is columns
Never set the size of JFrame manually. Use pack() method to decide
the size
Use SwingUtilities.InvokeLater() to run the GUI in another thread.

Panels overlap each other when box not big enough

I have this gui; and when the height is not big enough the panes will overlap each other. I have to set it at least 200, so I can completely see the two rows; but when it is set at 200, then I have like a big empty row at the end, and I don't want that. How could I fix this? Thanks.
import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.*;
public class MyFrame extends JFrame {
JButton panicButton;
JButton dontPanic;
JButton blameButton;
JButton newsButton;
JButton mediaButton;
JButton saveButton;
JButton dontSave;
public MyFrame() {
super("Crazy App");
setSize(400, 150);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel row1 = new JPanel();
panicButton = new JButton("Panic");
dontPanic = new JButton("No Panic");
blameButton = new JButton("Blame");
newsButton = new JButton("News");
//adding first row
GridLayout grid1 = new GridLayout(4, 2, 10, 10);
setLayout(grid1);
FlowLayout flow1 = new FlowLayout(FlowLayout.CENTER, 10, 10);
row1.setLayout(flow1);
row1.add(panicButton);
row1.add(dontPanic);
row1.add(blameButton);
row1.add(newsButton);
add(row1);
//adding second row
JPanel row2 = new JPanel();
mediaButton = new JButton("Blame");
saveButton = new JButton("Save");
dontSave = new JButton("No Save");
GridLayout grid2 = new GridLayout(3, 2, 10, 10);
setLayout(grid2);
FlowLayout flow2 = new FlowLayout(FlowLayout.CENTER, 10, 10);
row2.setLayout(flow2);
row2.add(mediaButton);
row2.add(saveButton);
row2.add(dontSave);
add(row2);
setVisible(true);
}
public static void main(String[] args) {
MyFrame frame = new MyFrame();
}
}
The original code set the layout for one panel on two separate occasions. For clarity, set it once in the constructor.
The 2nd layout specified 3 rows
Call pack() on the top-level container to have the GUI reduce to the minum sze needed for the components.
End result
import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.*;
public class MyFrame17 extends JFrame {
JButton panicButton;
JButton dontPanic;
JButton blameButton;
JButton newsButton;
JButton mediaButton;
JButton saveButton;
JButton dontSave;
public MyFrame17() {
super("Crazy App");
setLayout(new GridLayout(2, 2, 10, 10));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel row1 = new JPanel();
panicButton = new JButton("Panic");
dontPanic = new JButton("No Panic");
blameButton = new JButton("Blame");
newsButton = new JButton("News");
FlowLayout flow1 = new FlowLayout(FlowLayout.CENTER, 10, 10);
row1.setLayout(flow1);
row1.add(panicButton);
row1.add(dontPanic);
row1.add(blameButton);
row1.add(newsButton);
add(row1);
//adding second row
JPanel row2 = new JPanel();
mediaButton = new JButton("Blame");
saveButton = new JButton("Save");
dontSave = new JButton("No Save");
FlowLayout flow2 = new FlowLayout(FlowLayout.CENTER, 10, 10);
row2.setLayout(flow2);
row2.add(mediaButton);
row2.add(saveButton);
row2.add(dontSave);
add(row2);
pack();
setVisible(true);
}
public static void main(String[] args) {
MyFrame17 frame = new MyFrame17();
}
}
Further tips
Don't extend frame, just use an instance of one.
Build the entire GUI in a panel which can then be added to a frame, applet, dialog..
When developing test classes, give them a more sensible name than MyFrame. A good word to add is Test, then think about what is being tested. This is about the layout of buttons, so ButtonLayoutTest might be a good name.
GUIs should be started on the EDT.

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