Create a custom component, extending from JPanel, override its getPreferredSize method to return the size of the window you would like. Either add this to your frame or set it as the frame’s content pane. Call pack on the frame Updated with example On my PC, the Frame size = java.awt.Dimension[width=216,height=238] import java.awt.BorderLayout; import java.awt.Dimension; … Read more
Like so : import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.Color; import java.awt.Dimension; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class CardLayoutDemo extends JFrame { public final String YELLOW_PAGE = “yellow page”; public final String RED_PAGE = “red page”; private final CardLayout cLayout; private final JPanel mainPane; boolean isRedPaneVisible; public CardLayoutDemo(){ setTitle(“Card Layout Demo”); setDefaultCloseOperation(EXIT_ON_CLOSE); setLocationRelativeTo(null); mainPane … Read more
Since JPanel doesn’t have a title bar, I’m assuming that you’re referring to JFrame. That being said, use setIconImage(…). Here is an example of using setIconImages(). import java.awt.Image; import javax.swing.*; import javax.imageio.ImageIO; import java.net.URL; import java.util.*; class FrameIcons { public static void main(String[] args) throws Exception { URL url16 = new URL(“http://i.stack.imgur.com/m0KKu.png”); URL url32 = … Read more
The Container returned by getContentPane() is, by default, the contentPane of a JRootPane managed by the top-level container, JFrame. Although, “as a convenience, the add method and its variants, remove and setLayout have been overridden to forward to the contentPane as necessary,” there’s no a priori way to know about the frame’s internal use of … Read more
Start with How to use tables. Your table model needs several things. It needs to return Boolean.class from the getColumnClass method for the appropriate column. You will need to override this method. The method isCellEditable will need to return true for the table column you want to make editable (so the user can change the … Read more
On the JDialog you’ve created you should call pack() first, then setLocationRelativeTo(parentFrame), and then setVisible(true). With that order the JDialog should appear centered on the parent frame. If you don’t call pack() first, then setting the location relative to the parent doesn’t work properly because the JDialog doesn’t know what size it is at that … Read more
This is based on this example and makes use of JXLayer to physically rotate the label component the way you want it. It also saves you from having to do any custom painting of your own. I’ve used a similar technique to rotate JTabbedPane tabs so they run vertically down the side of the JTabbedPane … Read more
Here are a few suggestions: Use a GridLayout for the top panel; in this case, zero means the number of rows is determined by the specified number of columns and the total number of components in the layout: JPanel north = new JPanel(new GridLayout(0, 9)); Here’s an outline of how you can make your center … Read more
but when i run it i get this: You get an empty screen because you add the components to the frame after the frame is visible. As has already been suggested you need to use an appropriate layout manager. FlowLayout is the easiest to start with. invoke setVisible(true) AFTER adding the components to the frame. … Read more
Use DocumentFilter: NumberOnlyFilter.java: import javax.swing.*; import javax.swing.text.*; import java.util.regex.*; public class NumberOnlyFilter extends DocumentFilter { public void insertString(DocumentFilter.FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException { StringBuilder sb = new StringBuilder(); sb.append(fb.getDocument().getText(0, fb.getDocument().getLength())); sb.insert(offset, text); if(!containsOnlyNumbers(sb.toString())) return; fb.insertString(offset, text, attr); } public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attr) … Read more