applet1.java~8~

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

package vector;

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

public class Applet1 extends Applet {
  private Vector xVector;
  private Vector yVector;
  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 Applet1() {
  }
  /**Initialize the applet*/
  public void init() {
    xVector = new Vector(360);
    yVector = new Vector(360);
    double x,y;
    Double xObject,yObject;
    for(int i = 0;i<360;i++){
       x = -1.8+0.01*i;
       y = Math.exp(x);
       xObject = new Double(x*20+50);
       yObject = new Double(y*50+100);
       xVector.addElement(xObject);
       yVector.addElement(yObject);
    }
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  public void paint(Graphics g){
    int x1,y1,x2,y2;
    for(int i=0;i<360;i++){
       x1=((Double)xVector.elementAt(i)).intValue();
       y1=((Double)yVector.elementAt(i)).intValue();
       x2=((Double)xVector.elementAt(i+1)).intValue() ;
       y2=((Double)yVector.elementAt(i+1)).intValue() ;
       g.drawLine(x1,y1,x2,y2);
     }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }
}