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import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
public class test//¶ÁÕß¿ÉÒÔ¸ü¸ÄÀàtestµÄÃû×Ö£¬ÒÔÊʺÏ×Ô¼º¶¨ÒåµÄ.javaÎļþ£¬ÒòΪËüÖ»ÊÇÓÃÀ´²âÊԵġ£
{
 public static void main (String args[]){
     DrawFrame frame=new DrawFrame();
     frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
     frame.setVisible(true);
    }
}
class DrawFrame extends JFrame
 {
 public DrawFrame()
 {
 setTitle("Activity Diagram"); 
 setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
// add panel to frame
 ArrowLinePanel panel=new ArrowLinePanel();
 add(panel);
 }
// »î¶¯Í¼´°¿Ú´óС
 public static final int DEFAULT_WIDTH=1000;
 public static final int DEFAULT_HEIGHT=800;
 }
 class ArrowLinePanel extends JPanel
{
 // confirm the line position
 
 public ArrowLinePanel()
 {
  setBackground(Color.white);
 }
 public void paintComponent(Graphics g)
 {
  super.paintComponent(g);
 
 Graphics2D g2=(Graphics2D) g; 
  g2.setPaint(Color.black);
 drawAL(x1, y1, x2, y2, g2)£»//ÕâÀïx1, y1, x2, y2±ØÐëÒªÉùÃ÷²¢ÇÒ³õʼ»¯£¬¶ø¾ßÌåÉùÃ÷µÄλÖúͳõʼ»¯µÄÖµ
//ÓɱàÕß×Ô¼º¾ö¶¨£¬ÔÚÕâÀ±ÊÕßûÓÐÉùÃ÷ËüÃÇ¡£
}
 public static void drawAL(int sx, int sy, int ex, int ey,Graphics2D g2)
{
        double  H  =   6 ;  // ¼ýÍ·¸ß¶È   
         double  L  =   6 ; // µ×±ßµÄÒ»°ë  
         int  x3  =   0 ;
         int  y3  =   0 ;
         int  x4  =   0


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