홍대 자바 수업 : 패널

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import java.awt.event.*; import java.awt.*;   class Fram extends Frame {     Panel pan01,pan02,pan03;     public Fram(){     super("윈도우 이벤트");       pan01 =new Panel();     pan02 =new Panel();     pan03 =new Panel();           pan01.setBackground(Color.green);     pan02.setBackground(Color.red);     pan03.setBackground(Color.black);     add(BorderLayout.NORTH,pan01);     add(BorderLayout.CENTER,pan02);     add(BorderLayout.EAST,pan03);       pan01.add(new Button("Button 01"));     pan02.add(new Button("Button 02-1"));     pan03.add(new Button("Button 03-1"));       setSize(300,200);     setVisible(true);     pan03.setVisible(false);           addWindowListener(new WindowAdapter() {         public void windowClosing(WindowEvent e){             dispose();             System.exit(0);         }     }     );             addWindowListener(new WindowAdapter() {         public void windowIconified(WindowEvent e){             dispose();             System.exit(0);         }     }     );       }           }     class Frame1  extends Frame {     public static void main(String[] args) throws Exception       {         new Fram();       } }