ｈ１００ - プログラム倉庫

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

class game0528 extends Canvas {
   Frame fr;
int x;
  
   public void paint( Graphics g ) {
       x=x+1;
g.fillRect(50*x, 50,50,50);
   }

   game0528() {
x=0;      
fr = new Frame( "フレーム" );
       setSize( 500, 500 );
       fr.add( this, BorderLayout.NORTH );
       Button bu = new Button( "ボタン" );
       fr.add( bu, BorderLayout.CENTER );

       bu.addActionListener( new ActionListener() {
           public void actionPerformed( ActionEvent e ) {
               repaint();
           }
       } );

       fr.pack();
       fr.setVisible( true );    
fr.addWindowListener(new stopwin());
}

class stopwin extends WindowAdapter{
  public void windowClosing(WindowEvent we){System.exit(0);}
  }

   public static void main( String[] args ) {
       game0528 dr= new game0528();
   }
}