garbage collector for JFrame's object

Question

import javax.swing.*;

public class Main
{
    public Main()
    {
        JFrame jf = new JFrame(\"Demo\");
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          


        

Answer 1

Given the invokeLater() call, the call to GC will probably occur 1st¹.

BTW - calling Runtime.gc() is generally pointless, the JRE won't GC till it needs to.

1. E.G.

Output

GC called
Frame visible

Code

package test;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class VisibleFrameGC {

    VisibleFrameGC() {
        JFrame jf = new JFrame("Demo");
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setSize(100, 100);
        jf.setVisible(true);
        System.out.println("Frame visible");
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new VisibleFrameGC();
            }
        });
        Runtime.getRuntime().gc();
        System.out.println("GC called");
    }
}