java_绘制图形_示例代码_

import javax.swing.*;
import java.awt.*;
public class Example runnian extends JFrame    //当前类继承自JFrame,可生成框架           
 {
 	public Example runnian()
 	{
 		Pan p=new Pan();             //框架中加载面板
 		this.add(p);
 	}
 
	public static void main(String[] args)
  {
  	Example runnian t=new Example runnian(); //生成框架对象
    t.setSize(400,400);         //设定大小
  	t.setVisible(true);;         //设定可视
  	t.setDefaultCloseOperation(t.EXIT_ON_CLOSE);//设置右上角关闭图标
  }
  }
  class Pan extends JPanel
  {
  	public void paint(Graphics g)   //显示各种图形的paint()方法
  	{
  		g.drawLine(50,50,100,100);   //绘制直线
  		g.fillOval(100,100,50,50);   //绘制椭圆
  		g.drawRect(300,200,50,100);  //绘制矩形
  		g.fillRoundRect(200,100,100,50,10,20);//绘制圆角矩形
  		g.fillArc(200,200,100,200,100,100);//椭圆弧框
  	}
  }