import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ButtonGUI extends JFrame implements ActionListener{
private JButton button1;
private JButton button2;
...
Type: Posts; User: yeong
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...