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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;class MulticastPanel extends JPanel
implements ActionListener
{ public MulticastPanel()
{ JButton newButton = new JButton("New");
add(newButton);
newButton.addActionListener(this); closeAllButton = new JButton("Close all");
add(closeAllButton);
} public void actionPerformed(ActionEvent evt)
{ // handles New button
SimpleFrame f = new SimpleFrame();
counter++;
f.setTitle("Window " + counter);
f.setSize(200, 150);
f.setLocation(30 * counter, 30 * counter);
f.show();
closeAllButton.addActionListener(f);
} public static void setCounter(int i)//i add
{ //i add
counter=i; //i add
} //i add
private static int counter = 0; //i add
private JButton closeAllButton;
} class MulticastFrame extends JFrame
{ public MulticastFrame()
{ setTitle("MulticastTest");
setSize(300, 200);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
} ); Container contentPane = getContentPane();
contentPane.add(new MulticastPanel());
}
}public class MulticastTest
{ public static void main(String[] args)
{ JFrame frame = new MulticastFrame();
frame.show();
}
}class SimpleFrame extends JFrame
implements ActionListener
{ public void actionPerformed(ActionEvent evt)
{ // handles Close all button
dispose();
MulticastPanel.setCounter(0); //i add
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;class MulticastPanel extends JPanel
implements ActionListener
{ public MulticastPanel()
{ JButton newButton = new JButton("New");
add(newButton);
newButton.addActionListener(this); closeAllButton = new JButton("Close all");
add(closeAllButton);
} public void actionPerformed(ActionEvent evt)
{ // handles New button
SimpleFrame f = new SimpleFrame();
counter++;
f.setTitle("Window " + counter);
f.setSize(200, 150);
f.setLocation(30 * counter, 30 * counter);
f.show();
closeAllButton.addActionListener(f);
} public static void setCounter(int i)//i add
{ //i add
counter=i; //i add
} //i add
private static int counter = 0; //i add
private JButton closeAllButton;
} class MulticastFrame extends JFrame
{ public MulticastFrame()
{ setTitle("MulticastTest");
setSize(300, 200);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{ System.exit(0);
}
} ); Container contentPane = getContentPane();
contentPane.add(new MulticastPanel());
}
}public class MulticastTest
{ public static void main(String[] args)
{ JFrame frame = new MulticastFrame();
frame.show();
}
}class SimpleFrame extends JFrame
implements ActionListener
{ public void actionPerformed(ActionEvent evt)
{ // handles Close all button
dispose();
MulticastPanel.setCounter(0); //i add
}
}
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