applet1.java

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

package whileexample;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import com.borland.jbcl.layout.*;

public class Applet1 extends Applet {
  double x,y;
  double result[];
  int mul ;
  int i,j ;
  boolean isStandalone = false;
  XYLayout xYLayout1 = new XYLayout();
  TextField text1 = new TextField();
  Label label1 = new Label();
  Button button1 = new Button();
  /**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() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception {
    this.setLayout(xYLayout1);
    label1.setText("计算exp(x)   x=");
    button1.setFont(new java.awt.Font("Dialog", 0, 16));
    button1.setLabel("确定");
    button1.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        button1_mouseClicked(e);
      }
    });
    text1.setFont(new java.awt.Font("Dialog", 0, 16));
    this.add(text1, new XYConstraints(148, 50, 72, 26));
    this.add(label1,   new XYConstraints(54, 52, 81, 21));
    this.add(button1,      new XYConstraints(40, 105, 181, 24));
  }
  /**Get Applet information*/
  public String getAppletInfo() {
    return "Applet Information";
  }
  /**Get parameter info*/
  public String[][] getParameterInfo() {
    return null;
  }


  public void paint(Graphics g){
     g.drawString("结果是："+String.valueOf(result[i]),100,200);
  }

  void button1_mouseClicked(MouseEvent e) {
      i = 1;
      result = new double[1000];
      result[0] = 1;
      String str1 = text1.getText() ;
      try{
          x = Double.parseDouble(str1);
          result[1] = 1+x;
          do{
            i++;
            mul=1;
            y=1;
            for(j=1;j<=i;j++){
               mul = mul*j;
               y = y*x;
            }
            result[i] = result[i-1] + y/mul;
          }
          while(Math.abs(result[i]-result[i-1])>0.00001);
          repaint();
      }
      catch(Exception ex){
         ex.printStackTrace() ;
       }
  }
}