selfaddingoval.java

Java程序设计(美) David D. Riley著 机械工业出版社 书籍配套 代码

// Figure 15.5

import javax.swing.JFrame;
public class SelfAddingOval extends Oval  {

	/** pre:	w != null  <br>
	 *	post:	this is instantiated
	 *			and  getX() == x  and  getY() == y
	 *			and  getWidth() == w  and  getHeight() == h
	 *			and  getParent() == win.getContentPane()  
	 */
	public SelfAddingOval(int x, int y, int w, int h, JFrame win )   {
		super(x, y, w, h);
		win.add(this, 0);
		repaint();
	}
}