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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;


public class ButtonGUI extends JFrame implements ActionListener{
private JButton button1;
private JButton button2;
...

Suppose you have an Object A , with public methods a() and b() , and private method c() . And supose you have a subclass of A named B with methods named b() , c() , d() . Draw a UML diagram showing...