java绘图

package test01;
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;
public class day2 extends JFrame{
 public day2() {
  super();
  initialize();
 }                                         //调用初始化方法
 
 private void initialize() {
  this.setSize(900,900);                //设置窗体大小
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置窗体关闭模式
  add(new CanvasPanel());//设置窗体面板为 绘画面板对象
  this.setTitle("Halloworld");//窗体标题
 }
 public static void main(String[] args) {
  new day2().setVisible(true);
 }
 class CanvasPanel extends JPanel{
  public void paint(Graphics g) {
   super.paint(g);
   Graphics2D g2=(Graphics2D)g;
   Shape[] shapes=new Shape[4];//声明图形数组
   shapes[0]=new Ellipse2D.Double(5,5,100,100);// 创建圆型对象
   shapes[1]=new Rectangle2D.Double(110,5,100,100);//创建矩形对象
   
   shapes[2]=new Rectangle2D.Double(15,15,80,80);// 创建圆型对象
   shapes[3]=new Ellipse2D.Double(120,15,80,80);//创建矩形对象
   for(Shape shape:shapes) {
    Rectangle2D bounds=shape.getBounds2D();
    if(bounds.getWidth()==80)
     g2.fill(shape);// 填充图形
    else
     g2.draw(shape);//绘制图形
    
   }
   
  }
 }
 

}