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import javax.swing.*; import java.awt.event.*; import java.awt.*; public class Pgm3b implements ActionListener { public static void main(String[] args) { JFrame frame = new JFrame("Original Frame"); frame.setSize(300,300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Pgm3b obj = new Pgm3b(); JButton button = new JButton("View Message"); frame.add(button); button.addActionListener(obj); frame.setVisible(true); } public void actionPerformed(ActionEvent e) { JFrame sub_frame = new JFrame("Sub Frame"); sub_frame.setSize(200,200); JLabel label = new JLabel("!!! HELLO !!!"); sub_frame.add(label); sub_frame.setVisible(true); } }