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JAVA
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MainClass.java
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import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel { public MainClass() { JButton btn1 = new JButton("Button1"); btn1.addActionListener(new ButtonListener()); add(btn1); } public static void main(String[] args) { JFrame frame = new JFrame(); frame.getContentPane().add(new MainClass()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200, 200); frame.setVisible(true); } } class ButtonListener implements ActionListener { ButtonListener() { } public void actionPerformed(ActionEvent e) { if (e.getActionCommand().equals("Button1")) { System.out.println("Button1 has been clicked"); } } }