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("計算exp(x)   x=");    button1.setFont(new java.awt.Font("Dialog", 0, 16));    button1.setLabel("確定");    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("結果是："+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])>0.0001);          button1.setLabel(String.valueOf(Math.abs(result[i]-result[i-1])));          repaint();      }      catch(Exception ex){         ex.printStackTrace() ;       }  }}