Java编程——虚线与实线

package newpackage1;
import java.awt.*;
import javax.swing.*;

public class LineDemo extends JFrame{

    public LineDemo(){
        super("实线与虚线"); //调用父类构造函数        
        setSize(300,200); //设置窗口尺寸
        setVisible(true); //设置窗口可视
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序
    }
    
    public void paint(Graphics g){ //绘制组件方法
        Graphics2D g2=(Graphics2D)g; //得到2D图形
        Dimension dim = this.getSize(); //得到组件尺寸
        g2.setColor(Color.white); //设置绘制颜色为白色
        g2.fillRect(0, 0, dim.width, dim.height); //填充整个组件
        g2.setColor(Color.black); //设置绘制颜色
        g2.drawLine(40,160,280,160); //绘制实线
        g2.drawLine(40,160,40,40);
        g2.drawString("0",30,165); //绘制字符串
        g2.drawString("100",16,50);
        g2.drawString("200",270,175);
        
        float[] dash={5,5}; //短划线图案
        BasicStroke bs = new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER, 10.0f,dash,0.0f); //实例化新画刷
        g2.setStroke(bs); //设置新的画刷        

        g2.drawLine(40,160,100,120); //用新的画刷绘制虚线
        g2.drawLine(100,120,160,120);
        g2.drawLine(160,120,280,40);

    }

    public static void main(String[] args){
        new LineDemo();
    } 
}