jframe - w3toppers.com

Calling one JFrame from another using Timer without any buttons

Your question is very unclear, but the use of multiple frames is not recommended. As an alternative, consider a modeless dialog, shown below. The dialog’s enclosed JOptionPane listens for a PropertyChangeEvent, while counting down from TIME_OUT using javax.swing.Timer. The JOptionPane button is convenient but not required. import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowEvent; import … Read more

How do I Switch JPanels inside a JFrame

Instead of trying to add an remove components, use a CardLayout CardLayout cardLayout = new CardLayout(); JPanel mainPanel = new JPanel(cardLayout); MenuPanel menu = new MenuPanel(); GamePanel game = new GamePanel(); mainPanel.add(menu, “menu”); mainPanel.add(game, “game”); … public void gameOn() { cardLayout.show(mainPanel, “game”); } When gameOn() is called, the menu will get pushed to the back, … Read more

JTable not showing up on JFrame (Java)

I know thats not the problem tho because everything else shows up just fine Oh… really? Not in my computer… Let’s have a picture of your actual GUI shown in my PC: Does the GUI looks the same in your computer? I bet no. But… why does it looks like that in my PC? Well, … Read more

Java Bouncing Ball

With your current approach… The main problem I can see is that you are placing two opaque components on top of each other…actually you may find you’re circumventing one of them for the other… You should be using a null layout manager, otherwise it will take over and layout your balls as it sees fit. … Read more

Best practice for setting JFrame locations

Here is an example that incorporates the advice of: Hovercraft Full Of Eels – set location by platform. Aardvocate Akintayo Olu – serialize the location. But goes on to add 2 tweaks: Serialize the width/height as well. If the frame is maximized at time of close, it is restored before getting the bounds. (I detest … Read more

Only one component shows up in JFrame

The content pane of a JFrame has a BorderLayout. If you place a component in a BL with no constraints it ends up in the CENTER. The center can only display one component. For an immediate effect, I suggest: f.add(top, BorderLayout.PAGE_START); f.add(mid); f.add(bot, BorderLayout.PAGE_END); Other points. Take out f.setSize(500, 500); and call pack() immediately before … Read more

How to set output stream to TextArea

You need to redirect the print stream to an output stream you can control… This is an example of concept I developed for an application I’m working on for work. We use this to bring up the output console when it’s running at user sites so we can see what’s being sent to standard out…until … Read more

Unresponsive KeyListener for JFrame

If you don’t want to register a listener on every component, you could add your own KeyEventDispatcher to the KeyboardFocusManager: public class MyFrame extends JFrame { private class MyDispatcher implements KeyEventDispatcher { @Override public boolean dispatchKeyEvent(KeyEvent e) { if (e.getID() == KeyEvent.KEY_PRESSED) { System.out.println(“tester”); } else if (e.getID() == KeyEvent.KEY_RELEASED) { System.out.println(“2test2”); } else if … Read more

Setting background images in JFrame

There is no built-in method, but there are several ways to do it. The most straightforward way that I can think of at the moment is: Create a subclass of JComponent. Override the paintComponent(Graphics g) method to paint the image that you want to display. Set the content pane of the JFrame to be this … Read more