import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class ButtonExample{
    ButtonExample(){
    JFrame f=new JFrame();
    JButton b=new JButton("Click");
    f.setLayout(null);
    f.add(b);
    b.setBounds(20,20,100,20);
    f.setVisible(true);
    f.setSize(300,100);
    b.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){

        JFrame frame=new JFrame();
        frame.add(new JLabel("Hello World"));
        frame.setVisible(true);
        frame.setSize(300,100);
        }
    });
    }
    public static void main(String[] args){
    new ButtonExample();
    }
}

<input type="submit" value="open new window" onclick="window.open('xyz.html', 'null', 'width=800,height=600,resizable=no');" />