I have come up with the below code:
String[] labels = {"Name: ", "Fax: ", "Email: ", "Address: "};
int numPairs = labels.length;
JFrame frame = new JFrame("SpringDemo1");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
Container contentPane = frame.getContentPane();
SpringLayout layout = new SpringLayout();
contentPane.setLayout(layout);
for (int i = 0; i < numPairs; i++)
{
JLabel lable = new JLabel(labels[i]);
contentPane.add(lable);
contentPane.add(new JTextField(15));
}
//Display the window.
frame.pack();
frame.setVisible(true);
Expectation:
What I am getting:
Default:
when resized:
The result is noway related to how code actually/normally looks like!
I also tried copy pasting and running the ready-made code: downloaded from here:
and this is how the result looks :
To put the components in the right place using SpringLayout, you should use the ( SpringUtilities class ), download it then include it in your project.
your code should be:
private static void createAndShowGUI() {
String[] labels = {"Name: ", "Fax: ", "Email: ", "Address: "};
int numPairs = labels.length;
//Create and populate the panel.
JPanel p = new JPanel(new SpringLayout());
for (int i = 0; i < numPairs; i++) {
JLabel l = new JLabel(labels[i], JLabel.TRAILING);
p.add(l);
JTextField textField = new JTextField(10);
l.setLabelFor(textField);
p.add(textField);
}
//Lay out the panel.
SpringUtilities.makeCompactGrid(p,
numPairs, 2, //rows, cols
6, 6, //initX, initY
6, 6); //xPad, yPad
//Create and set up the window.
JFrame frame = new JFrame("SpringForm");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Set up the content pane.
p.setOpaque(true); //content panes must be opaque
frame.setContentPane(p);
//Display the window.
frame.pack();
frame.setVisible(true);
}
i hope that helps you!
Related
I'm hoping this is an easy question. I have a JComboBox with the choices of 0, 1, 2, 3,...10. Depending on what number is selected in the JComboBox, I want my GUI to add a JLabel and a JTextField. So if the number 3 is chosen, the GUI should add 3 JLabels and 3 JTextFields. and so forth.
I'm using an array of JLabels and JTextFields to accomplish this, but I am getting a null pointer exception at runtime, and no labels or fields are being added.
Code:
private void createComponents()
{
//Create Action Listeners
ActionListener comboListener = new ComboListener();
//Create Components of the GUI
parseButton = new JButton("Parse Files");
parseButton.addActionListener(comboListener);
numberLabel = new JLabel("Number of Files to Parse: ");
String[] comboStrings = { "","1", "2","3","4","5","6","7","8","9","10" };
inputBox = new JComboBox(comboStrings);
inputBox.setSelectedIndex(0);
fieldPanel = new JPanel();
fieldPanel.setLayout(new GridLayout(2,10));
centerPanel = new JPanel();
centerPanel.add(numberLabel);
centerPanel.add(inputBox);
totalGUI = new JPanel();
totalGUI.setLayout(new BorderLayout());
totalGUI.add(parseButton, BorderLayout.SOUTH);
totalGUI.add(centerPanel, BorderLayout.CENTER);
add(totalGUI);
}
ActionListener Code:
public void actionPerformed(ActionEvent e)
{
JTextField[] fileField = new JTextField[inputBox.getSelectedIndex()];
JLabel[] fieldLabel = new JLabel[inputBox.getSelectedIndex()];
for(int i = 0; i < fileField.length; i++)
{
fieldLabel[i].setText("File "+i+":"); //NULL POINTER EXCEPTION HERE
fieldPanel.add(fieldLabel[i]); //NULL POINTER EXCEPTION HERE
fieldPanel.add(fileField[i]);
}
centerPanel.add(fieldPanel);
repaint();
revalidate();
}
Thanks to MadProgrammer's comment, this question has been answered.
Editing the loop to:
for(int i = 0; i < fileField.length; i++)
{
fieldLabel[i] = new JLabel();
fileField[i] = new JTextField();
fieldLabel[i].setText("File "+i+":");
fieldPanel.add(fieldLabel[i]);
fieldPanel.add(fileField[i]);
}
resolved the issue.
I am trying to create a simple menu interface with 4 rows of various buttons and labels using GridLayout with FlowLayout inside each grid for organising the elements. However the space for the buttons and labels which should only take 1 line takes up a huge amount of space.
This is what my interface looks like minimized:
This is what it looks like maximized:
I am looking to set the maximum size of the labels panels/grid so that it only takes a small amount of space.
I am trying to make all the elements visible without anything being hidden with as small a window size as possible like this:
This is my code:
public class Window extends JFrame{
public Window() {
super("TastyThai Menu Ordering");
}
public static void main(String[] args) {
Window w = new Window();
w.setSize(500, 500);
w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel title = new JLabel("TastyThai Menu Order", SwingConstants.CENTER);
title.setFont(title.getFont().deriveFont(32f));
//generate page title
Container titlePanel = new JPanel(); // used as a container
titlePanel.setBackground(Color.WHITE);
FlowLayout flow = new FlowLayout(); // Create a layout manager
titlePanel.setLayout(flow);// assign flow layout to panel
titlePanel.add(title); // add label to panel
w.getContentPane().add(BorderLayout.NORTH,titlePanel);
//generate row containers
Container r1 = new JPanel(new FlowLayout());
Container r2 = new JPanel(new FlowLayout());
Container r3 = new JPanel(new FlowLayout());
Container r4 = new JPanel(new FlowLayout());
//generate mains radio buttons
Container mains = new JPanel(new GridLayout(7, 0));
mains.setBackground(Color.RED);
JLabel mainsHeader = new JLabel("Mains");
mains.add(mainsHeader);
String[] mainsChoices = {"Vegetarian", "Chicken", "Beef", "Pork", "Duck", "Seafood Mix"};
JRadioButton[] mainsRadioButton = new JRadioButton[6];
ButtonGroup mainsButtons = new ButtonGroup();
for(int i = 0; i < mainsChoices.length; i++) {
mainsRadioButton[i] = new JRadioButton(mainsChoices[i]);
mains.add(mainsRadioButton[i]);
mainsButtons.add(mainsRadioButton[i]);
}
//generate noodles radio buttons
Container noodles = new JPanel(new GridLayout(7, 0));
noodles.setBackground(Color.GREEN);
JLabel noodlesHeader = new JLabel("Noodles");
noodlesHeader.setFont(noodlesHeader.getFont().deriveFont(24f));
noodles.add(noodlesHeader);
String[] noodlesChoices = {"Pad Thai", "Pad Siew", "Ba Mee"};
JRadioButton[] noodlesRadioButton = new JRadioButton[3];
ButtonGroup noodlesButtons = new ButtonGroup();
for(int i = 0; i < noodlesChoices.length; i++) {
noodlesRadioButton[i] = new JRadioButton(noodlesChoices[i]);
noodles.add(noodlesRadioButton[i]);
noodlesButtons.add(noodlesRadioButton[i]);
}
//generate sauces radio buttons
Container sauces = new JPanel(new GridLayout(7, 0));
sauces.setBackground(Color.BLUE);
JLabel saucesHeader = new JLabel("Sauce");
saucesHeader.setFont(saucesHeader.getFont().deriveFont(24f));
sauces.add(saucesHeader);
String[] saucesChoices = {"Soy Sauce", "Tamarind Sauce"};
JRadioButton[] saucesRadioButton = new JRadioButton[2];
ButtonGroup saucesButtons = new ButtonGroup();
for(int i = 0; i < saucesChoices.length; i++) {
saucesRadioButton[i] = new JRadioButton(saucesChoices[i]);
sauces.add(saucesRadioButton[i]);
saucesButtons.add(saucesRadioButton[i]);
}
//generate extras check boxes
Container extras = new JPanel(new GridLayout(7, 0));
extras.setBackground(Color.YELLOW);
JLabel extrasHeader = new JLabel("Extra");
extrasHeader.setFont(extrasHeader.getFont().deriveFont(24f));
extras.add(extrasHeader);
String[] extrasChoices = {"Mushroom", "Egg", "Broccoli", "Beansrpout", "Tofu"};
JCheckBox[] extrasBoxes = new JCheckBox[5];
for(int i = 0; i < extrasChoices.length; i++) {
extrasBoxes[i] = new JCheckBox(extrasChoices[i]);
extras.add(extrasBoxes[i]);
}
JLabel selectionPrice = new JLabel("Selection Price: $ ");
JLabel selectionPriceVal = new JLabel("_______________");
JButton addToOrder = new JButton("Add to Order");
JLabel totalPrice = new JLabel("Total Price: $ ");
JLabel totalPriceVal = new JLabel("_______________");
JButton clearOrder = new JButton("Clear Order");
JRadioButton pickUp = new JRadioButton("Pick Up");
JRadioButton delivery = new JRadioButton("Delivery");
ButtonGroup pickupDelivery = new ButtonGroup();
pickupDelivery.add(pickUp);
pickupDelivery.add(delivery);
JButton completeOrder = new JButton("Complete Order");
Container menuSelection = new JPanel(new GridLayout(4,0));
menuSelection.add(r1);
r1.add(mains);
r1.add(noodles);
r1.add(sauces);
r1.add(extras);
menuSelection.add(r2);
r2.add(selectionPrice);
r2.add(selectionPriceVal);
r2.add(addToOrder);
menuSelection.add(r3);
r3.add(totalPrice);
r3.add(totalPriceVal);
r3.add(clearOrder);
menuSelection.add(r4);
r4.add(pickUp);
r4.add(delivery);
r4.add(completeOrder);
w.getContentPane().add(BorderLayout.CENTER, menuSelection);
w.setVisible(true);
}
}
GridLayout does not support that. All rectangles have the same size.
Take a look at the GridBagLayout, which supports dynamic resizing and much more.
I need help changing the size of my TextField. I have a JScrollPane at the beginning of my panel (Which is big so I can read more data), then I have a JLabel for instructions and in the end I would like to add a JTextArea which I only need a row for entering a number. The problem is that the elements are quite big in the panel.
I attach the result:
Here is my code:
public static void delete()
{
int deletePosition;
String[] options = {"Confirm", "Cancel"};
JPanel panel = new JPanel();
JLabel label0 = new JLabel("Write the Position[#]:");
JLabel labelJump1 = new JLabel("");
JTextField txtDelete = new JTextField(1);
GridLayout gridLayout = new GridLayout(0,1);
panel.setLayout(gridLayout);
String fullText = "";
JTextArea textArea = new JTextArea(15,30);
textArea.setText(fullText);
textArea.setEditable(false);
JScrollPane scrollPane = new JScrollPane(textArea);
panel.add(scrollPane);
panel.add(label0);
panel.add(labelJump1);
panel.add(txtDelete);
try
{
if (theEntityCollection.checkEmpty())
JOptionPane.showMessageDialog(null, "The collection is EMPTY");
else
{
for(int i = 0 ; i < theEntityCollection.getArraySize() ; i++)
{
fullText += "Position [" + (i+1) + "]\n\n" + theEntityCollection.getEntity(i);
if (i != theEntityCollection.getArraySize() - 1)
fullText += "_____________________\n\n";
textArea.setText(fullText);
}
deletePosition = JOptionPane.showOptionDialog(null, panel, "ENTITY COLLECTION", JOptionPane.NO_OPTION, JOptionPane.PLAIN_MESSAGE, null, options , options[0]);
}
}
catch(Exception e)
{
System.out.println("FAILED");
}
fullText = "";
}
I must say that I'm new with the Java GUI.
I'll appreciate a lot if you could help me!
GridLayout is doing exactly what it was designed to do. It provides each component with exactly the same amount of space evenly distributed based on the available space. You'll probably need to use a more flexible layout manager, for example...
Start by chaning...
GridLayout gridLayout = new GridLayout(0,1);
panel.setLayout(gridLayout);
to something like...
GridBagLayout gridLayout = new GridBagLayout();
panel.setLayout(gridLayout);
GridBagConstraints gbc = new GridBagConstraints();
gbc.weightx = 1;
gbc.anchor = GridBagConstraints.WEST;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.insets = new Insets(2, 2, 2, 2);
And then change...
panel.add(scrollPane);
panel.add(label0);
panel.add(labelJump1);
panel.add(txtDelete);
to something more like...
panel.add(scrollPane, gbc);
panel.add(label0, gbc);
panel.add(labelJump1, gbc);
panel.add(txtDelete, gbc);
Take a look at Laying Out Components Within a Container and How to Use GridBagLayout for more details
I added MouseListener to select a particular row from table,the content of row is getting printed on console but I want to print this content on new frame what should I do for this.
I attached my code along with the screenshot of the table.
thanks for help.
This is my code.
final JTable table = new JTable(data, columnNames);
JScrollPane scrollPane = new JScrollPane( table );
cp.add(scrollPane,BorderLayout.CENTER);
frame.add(cp);
frame.setSize(300,300);
frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
frame.pack();
frame.setVisible(true);
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e){
if(e.getClickCount()==1){
JTable target = (JTable)e.getSource();
System.out.println(target);
int row = target.getSelectedRow();
System.out.println(row);
Object [] rowData = new Object[table.getColumnCount()];
Object [] colData = new Object[table.getRowCount()];
for(int j = 0;j < table.getRowCount();j++)
for(int i = 0;i < table.getColumnCount();i++)
{
rowData[i] = table.getValueAt(j, i);
System.out.println(rowData[i]);
}
}
}
});
}
First of all, if you make a graphical interface with swing, you can't use System.out.print.
You need to set every row in a Label and print it out that way. If it is a Label then you can select it with your mouse
In the Mouse Listener method, Call the new JFrame,
in that JFrame , put the Contents of selected Row to Constructor Parameters.
JFrame newframe=new JFrame("Selected Contents);
When you output the result (System.out.println(rowData[i]);) just create a new JFrame and place the text you want to output here :
...
JFrame secondFrame = new JFrame();
JPanel myPanel = new JPanel();
for(int j = 0;j < table.getRowCount();j++){
for(int i = 0;i < table.getColumnCount();i++){
rowData[i] = table.getValueAt(j, i);
JLabel label = new JLabel(rowData[i]);
myPanel.add(label);
}
}
secondFrame.add(myPanel);
secondFrame.setVisible(true);
....
I'm pretty sure I've done it this way before, but for some reason, the JFrame won't show up when I run it.
JLabel originalString = new JLabel("Original String: "
+ str.getMutator());
JLabel currentString = new JLabel("Current String: "
+ str.getMutator());
JLabel finalString = new JLabel("Final String: " + str.getTarget());
JPanel panel = new JPanel();
panel.add(originalString);
panel.add(currentString);
panel.add(finalString);
JFrame frame = new JFrame("Mutating String!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
Try to set size or check with the preferred size of your components probably because you call pack().
frame.setSize(x, y);
Your problem must be somewhere else (is the method called does it throw an exception ?) because your code works (I commented the str calls) :
http://img217.imageshack.us/img217/902/screenvlg.png
import javax.swing.*;
public class Test{
public static void main(String... args){
JLabel originalString = new JLabel("Original String: " /*+ str.getMutator()*/);
JLabel currentString = new JLabel("Current String: "/* + str.getMutator()*/);
JLabel finalString = new JLabel("Final String: " /* + str.getTarget()*/);
JPanel panel = new JPanel();
panel.add(originalString);
panel.add(currentString);
panel.add(finalString);
JFrame frame = new JFrame("Mutating String!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}