/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.awt.Dimension;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
 
import javax.swing.JFrame;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone extends JFrame
{
	private JFrame frame;
 
	public void testSwing(){
		frame = new JFrame("Hello World");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setMinimumSize(new Dimension(300, 400));
        frame.setVisible(true);
 
        frame.addComponentListener(new ComponentAdapter() {
        	@Override
            public void componentResized(ComponentEvent e){
                Dimension d= frame.getSize();
                Dimension minD=frame.getMinimumSize();
                if(d.width<minD.width)
                    d.width=minD.width;
                if(d.height<minD.height)
                    d.height=minD.height;
                frame.setSize(d);
            }
        });
	}
 
	public static void main (String[] args) throws java.lang.Exception
	{
		Ideone sg = new Ideone();
    	sg.testSwing();
	}
}

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