Java Graphics_5

package com.han;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

@SuppressWarnings("serial")
public class Graphics_5 extends JFrame {

	public Graphics_5() {
		// TODO Auto-generated constructor stub
		getContentPane().add(new CanvasPanel());
	}

	class CanvasPanel extends JPanel {
		public void paint(Graphics g) {
			super.paint(g);
			Graphics2D g2 = (Graphics2D) g;
			Shape[] shapes = new Shape[4];
			shapes[0] = new Ellipse2D.Double(5, 5, 100, 100);
			shapes[1] = new Rectangle2D.Double(110, 5, 100, 100);
			shapes[2] = new Rectangle2D.Double(15, 15, 80, 80);
			shapes[3] = new Ellipse2D.Double(120, 15, 80, 80);
			
//			g2.draw(shapes[0]);
//			g2.draw(shapes[1]);
//			g2.fill(shapes[2]);
//			g2.fill(shapes[3]);
			
			for (Shape shape : shapes) {
				Rectangle2D bounds = shape.getBounds2D();
				if (bounds.getWidth() == 80)
					g2.fill(shape);
				else
					g2.draw(shape);
			    // 注意上面的if-else代码块如果有返回值则可以用三元运算符来代替
			}
			
		}
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Graphics_5 frame = new Graphics_5();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setTitle("JFrame");
		frame.setSize(300, 200);
		frame.setVisible(true);
	}

}