30 30 - プログラム倉庫

import java.awt.*;
import java.awt.event.*;

class java0730 extends Frame{

  public static void main(String [] args) { 
      java0730 f=new java0730();  
      f.setSize(600,600);  
      f.show(); 

f.addWindowListener(new WindowAdapter()
{

public void windowClosing(WindowEvent we){System.exit(0);} 

});

}
}