Set JFrame decoration to MetalLookAndFeel decoration

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COMPLETE SOURCE CODE FOR : SetJFrameDecorationToMetalLookAndFeel.java
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import javax.swing.*;
import java.awt.FlowLayout;

public class SetJFrameDecorationToMetalLookAndFeel
{
public static void main(String[]args)
{
 //Set JFrame decoration to current look and feel decoration
 //You can try to make this line as comment and
 //after that try compile and execute it to see it's differential
       JFrame.setDefaultLookAndFeelDecorated(true);
      
       JButton myButton=new JButton("Click On Me");
      
 JFrame myFrame=new JFrame("Set JFrame window decoration to current look and feel");
 myFrame.setLayout(new FlowLayout());

 myFrame.add(myButton);
 myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 myFrame.setSize(400,400);
 myFrame.setLocationRelativeTo(null);
 myFrame.setVisible(true);
}
}

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JUST COMPILE AND EXECUTE IT
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