Create a Frame using Swing in java

Code:

import javax.swing.*;
public class Sframe
{
Sframe()
{
JFrame f=new JFrame();
JButton b=new JButton("click");
b.setBounds(130,100,100,40);
f.add(b);
f.setSize(500,700);
f.setLayout(null);
f.setVisible(true);
}
public static void main(String[]args)
{
Sframe s=new Sframe();
}
}

Result: