ウインドウの内容

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     1  import javax.swing.*;
     2  import java.awt.*;
     3  
     4  public class Sample3
     5  {
     6         public static void main(String[] args)
     7         {
     8                 JFrame f;
     9                 Container cp;
    10                 JPanel p;
    11                 
    12                 f = new JFrame();
    13                 f.setVisible(true);
    14                 f.setTitle("swing");
    15                 f.setSize(200, 300);
    16                 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    17                 cp = f.getContentPane();
    18                 p = new JPanel();
    19                 cp.add(p);
    20         }
    21  }
  

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• 

     1  import javax.swing.*;
     2  import java.awt.*;
     3  
     4  public class Sample4 extends JPanel
     5  {
     6         public void paintComponent(Graphics g)
     7         {
     8                 g.drawRect(50,50,100,150);
     9         }
    10  }
  

   public static void main(String[] args)
   {
          ...
          Sample4 p;      
          ...
          p = new Sample4();
          ...
   }