zhe.java

Jbuilder100个例子 都是经典例子 对大家学习Jbuilder非常有帮助

package line;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class zhe extends Applet {
  int x1=-1,y1=-1;
  boolean flag=true;
  int x2,y2;
  boolean isStandalone = false;
  /**Get a parameter value*/
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  /**Construct the applet*/
  public zhe() {
  }
  /**Initialize the applet*/
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    this.setBackground(Color.white);
    this.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mousePressed(MouseEvent e) {
        this_mousePressed(e);
      }
    });
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }

  void this_mousePressed(MouseEvent e) {
  flag=!flag;
  if(flag==true){
      x1=e.getX();
      y1=e.getY();
  }
  else{
      x2=e.getX();
      y2=e.getY();
  }
  if(x1!=-1 && y1!=-1)
  repaint();
  }
  public void update(Graphics g){
    paint(g);
  }
  public void paint(Graphics g){
  g.setColor(Color.red);
  g.drawLine(x1,y1,x2,y2);
  }
}