jframe – Page 2 – Tarik Billa

How to hide a JFrame in system tray of taskbar

August 24, 2023 by Tarik

import java.awt.*; import java.awt.event.*; import javax.swing.JFrame; import javax.swing.UIManager; /** * * @author Mohammad Faisal * ermohammadfaisal.blogspot.com * facebook.com/m.faisal6621 * */ public class HideToSystemTray extends JFrame{ TrayIcon trayIcon; SystemTray tray; HideToSystemTray(){ super(“SystemTray test”); System.out.println(“creating instance”); try{ System.out.println(“setting look and feel”); UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); }catch(Exception e){ System.out.println(“Unable to set LookAndFeel”); } if(SystemTray.isSupported()){ System.out.println(“system tray supported”); tray=SystemTray.getSystemTray(); Image image=Toolkit.getDefaultToolkit().getImage(“/media/faisal/DukeImg/Duke256.png”); ActionListener … Read more

KeyListener, keyPressed versus keyTyped

August 7, 2023 by Tarik

keyPressed – when the key goes down keyReleased – when the key comes up keyTyped – when the unicode character represented by this key is sent by the keyboard to system input. I personally would use keyReleased for this. It will fire only when they lift their finger up. Note that keyTyped will only work … Read more

Setting background images in JFrame

July 31, 2023 by Tarik

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

How do I save preference user settings in Java?

July 19, 2023 by Tarik

You can use java.util.prefs package. A simple example: // Retrieve the user preference node for the package com.mycompany Preferences prefs = Preferences.userNodeForPackage(com.mycompany.MyClass.class); // Preference key name final String PREF_NAME = “name_of_preference”; // Set the value of the preference String newValue = “a string”; prefs.put(PREF_NAME, newValue); // Get the value of the preference; // default value … Read more

Java/Swing: Obtain Window/JFrame from inside a JPanel

June 29, 2023 by Tarik

You could use SwingUtilities.getWindowAncestor(…) method that will return a Window that you could cast to your top level type. JFrame topFrame = (JFrame) SwingUtilities.getWindowAncestor(this);

JPanel vs JFrame in Java

June 10, 2023 by Tarik

You should not extend the JFrame class unnecessarily (only if you are adding extra functionality to the JFrame class) JFrame: JFrame extends Component and Container. It is a top level container used to represent the minimum requirements for a window. This includes Borders, resizability (is the JFrame resizeable?), title bar, controls (minimize/maximize allowed?), and event … Read more

Java – How to create a custom dialog box?

May 31, 2023 by Tarik

If you don’t need much in the way of custom behavior, JOptionPane is a good time saver. It takes care of the placement and localization of OK / Cancel options, and is a quick-and-dirty way to show a custom dialog without needing to define your own classes. Most of the time the “message” parameter in … Read more

JFrame: How to disable window resizing?

May 29, 2023 by Tarik

You can use a simple call in the constructor under “frame initialization”: setResizable(false); After this call, the window will not be resizable.

How to maximize a JFrame through code?

May 26, 2023 by Tarik

Try this: f.setExtendedState( f.getExtendedState()|JFrame.MAXIMIZED_BOTH );

Difference between JPanel, JFrame, JComponent, and JApplet

May 22, 2023 by Tarik

Those classes are common extension points for Java UI designs. First off, realize that they don’t necessarily have much to do with each other directly, so trying to find a relationship between them might be counterproductive. JApplet – A base class that let’s you write code that will run within the context of a browser, … Read more