drawrect2d.java

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import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;

public class DrawRect2D extends JFrame
{
	
	public DrawRect2D()
	{
		super("绘制 2D 矩形");        //调用父类JFrame的构造函数
		setSize(200, 150);          //设置窗口大小，宽度为200，高度为150
		setVisible(true);           //显示窗口
	}
	
	public void paint(Graphics g)
	{
		super.paint(g);              //调用父类方法paint()
		Graphics2D g2d = (Graphics2D)g;
		
		g2d.setPaint(Color.BLACK);
		//设置矩形边框宽度
		g2d.setStroke(new BasicStroke(2.0f));
		//绘制矩形，左上角坐标为(10,50),矩形宽为80,高为60
		g2d.draw(new Rectangle2D.Double(10, 50, 80, 60));
		
		g2d.setPaint(Color.BLUE);
		//用蓝颜色填充矩形
		g2d.fill(new Rectangle2D.Double(100, 50, 80, 60));
	}
	
	public static void main(String[] args) 
	{
		DrawRect2D application = new DrawRect2D();
        application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}