shape.java

金旭亮的java教案

import java.awt.*;
//图形的基类，提供各种属性
public abstract class Shape extends Object {
   private int x1, y1, x2, y2;
   private Color color = Color.black;

   public Shape()
   {
      setX1( 0 );
      setY1( 0 );
      setX2( 0 );
      setY2( 0 );
   }

   public Shape( int x1, int y1, int x2, int y2 )
   {
      setX1( x1 );
      setY1( y1 );
      setX2( x2 );
      setY2( y2 );
   }

   public final void setX1( int x ) { x1 = x; }

   public final int getX1() { return x1; }

   public final void setY1( int y ) { y1 = y; }

   public final int getY1() { return y1; }

   public final void setX2( int x ) { x2 = x; }

   public final int getX2() { return x2; }

   public final void setY2( int y ) { y2 = y; }

   public final int getY2() { return y2; }

   public void setColor( Color c ) { color = c; }

   public Color getColor() { return color; }
//需要子类覆盖
   public abstract void draw( Graphics g );   
}