JAVA编程实例:虚线与实线

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JAVA编程实例:虚线与实线

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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();
 }
}

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