Swing Panel Question

Swing Panel Question

By : Danilo Fukuoka
Date : January 10 2021, 01:57 PM
this will help If you haven't already, it sounds like you need to look at layout managers. Some layout managers honour the requested or preferred sizes of components, others don't.
By default a JFrame uses BorderLayout as the layout manager. When you add your calendar panel above without supplying constraints, it assumes you want the panel centred. Anything centred in a BorderLayout takes up all the available space, no matter what you set the bounds of the component to.
code :

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Swing Scala Question - 100% expansion of panel

Swing Scala Question - 100% expansion of panel

By : Vte. Muedra
Date : March 29 2020, 07:55 AM
may help you . The default layout of JPanel (and Panel) is FlowLayout. Using GridLayout or BorderLayout center should let the JTextArea fill the preferred size.
Addendum: Here's a (somewhat) comparable Java Swing example:
code :
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;

/** @see http://stackoverflow.com/questions/5421319 */
public class TextAreaTest extends JPanel {

    private static final int maxWidth = 900;
    private static final int maxHeight = 600;
    private static final int initXPos = 320;
    private static final int initYPos = 260;
    private JTextArea ta = new JTextArea();

    public TextAreaTest() {
        this.setPreferredSize(new Dimension(900, 600));
        this.setLayout(new GridLayout());
        ta.append("Hello, world!");

    private void display() {
        JFrame f = new JFrame("TextAreaTest");
        f.setLocation(initXPos, initYPos);

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            public void run() {
                new TextAreaTest().display();
Swing Timer : Don't rely on Swing timers ..Question mark; and concurrency Issues

Swing Timer : Don't rely on Swing timers ..Question mark; and concurrency Issues

By : faik berk guler
Date : March 29 2020, 07:55 AM
Hope this helps
At the same time i wonder which techniques do Karaoke maker & player software follow?
code :
    public void moreAccurateTimer(int period) { // Sleep time in
                                                // milliseconds
        long beforeTime, timeDiff, sleepTime;
        beforeTime = System.currentTimeMillis();
        boolean running = true;
        while (running) {

            timeDiff = System.currentTimeMillis() - beforeTime;
            sleepTime = period - timeDiff;

            if (sleepTime <= 0L) { // Even if doing stuff took longer than
                                    // period
                sleepTime = 5L; // sleep some anyway

            try {
            } catch (InterruptedException e) {

            beforeTime = System.currentTimeMillis();
Card Layout Panel showing wrong panel - Java Swing

Card Layout Panel showing wrong panel - Java Swing

By : user3673323
Date : March 29 2020, 07:55 AM
seems to work fine I don't thin the problem you are experiencing is in the code provided. The one thing I had to change to get this working is add the content pane, which was never added:
code :
public MainFrame(){

    contentPane = new JPanel();
    contentPane.setLayout(new CardLayout(20,20));


    this.add(this.contentPane); // I added this

    ////////////////////////listener for closing
How to resize correctly a panel automatically when another panel is dinamically moving java swing

How to resize correctly a panel automatically when another panel is dinamically moving java swing

By : user3537628
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , After using the recommendation of @JBNizet, i have used the BorderLayout https://docs.oracle.com/javase/8/docs/api/java/awt/BorderLayout.html to fit according to my specifications. And working fine now, The button is placed in north direction, the jPanel2 in west direction and jPanel1 in the center.
Erase Swing Content Pane/Panel & display a new panel

Erase Swing Content Pane/Panel & display a new panel

By : lllf
Date : March 29 2020, 07:55 AM
hop of those help? I have created an applet where when you press the button "Forgot Pass" I erase the current JPanel on the applet & create a new JPanel that displays the JComponents related to Retrieving/Forgetting a password. , Use mainPanel.revalidate(); and/or mainPanel.repaint(); methods.
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