java - Rescale JFrame content -

i creating jframe, , when window expanded want content stay centered, instead of staying same distance away side. using windowbuilder on eclipse.

is there quick way this?

one way, have container use gridbaglayout , add single content container without constraints.

for example:

import java.awt.gridbaglayout; import java.awt.image.bufferedimage; import java.io.ioexception; import java.net.url;  import javax.imageio.imageio; import javax.swing.*;  public class centeredcontent extends jpanel {    public static final string img_path = "https://duke.kenai.com/iconsized/duke.gif";     public centeredcontent() throws ioexception {       url imgurl = new url(img_path);       bufferedimage img = imageio.read(imgurl);       icon imgicon = new imageicon(img);       jlabel label = new jlabel(imgicon);        setlayout(new gridbaglayout());       add(label);    }     private static void createandshowgui() {       centeredcontent mainpanel = null;       try {          mainpanel = new centeredcontent();       } catch (ioexception e) {          e.printstacktrace();          system.exit(-1);       }        jframe frame = new jframe("centeredcontent");       frame.setdefaultcloseoperation(jframe.dispose_on_close);       frame.getcontentpane().add(mainpanel);       frame.pack();       frame.setlocationbyplatform(true);       frame.setvisible(true);    }     public static void main(string[] args) {       swingutilities.invokelater(new runnable() {          public void run() {             createandshowgui();          }       });    } }