import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

public class SecondGUI extends JFrame {
    public static void main(String[] args){
        new SecondGUI();
    }
    public SecondGUI(){
        super("SecondGUI");

        JButton jb = new JButton("Button");
        getContentPane().setLayout(new FlowLayout());
        getContentPane().add(jb);
        // getContentPane().add(jb, BorderLayout.CENTER);
        setSize(300,200);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }
    
}