package choice;import java.awt.*;import java.awt.event.*;import java.applet.*;import com.borland.jbcl.layout.*;public class choice extends Applet {  boolean isStandalone = false;  XYLayout xYLayout1 = new XYLayout();  Choice choice1 = new Choice();  /**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 choice() {  }  /**Initialize the applet*/  public void init() {    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception {    this.setLayout(xYLayout1);    choice1.setFont(new java.awt.Font("Dialog", 0, 16));    choice1.addHierarchyBoundsListener(new java.awt.event.HierarchyBoundsAdapter() {    });    this.add(choice1,     new XYConstraints(6, 9, 77, 20));    choice1.addItem("圓形");    choice1.addItem("正方形");    choice1.addItem("扇形");  }  /**Get Applet information*/  public String getAppletInfo() {    return "Applet Information";  }  /**Get parameter info*/  public String[][] getParameterInfo() {    return null;  }  public void paint(Graphics g){    switch(choice1.getSelectedIndex()){      case 0:         g.clearRect(100,100,50,50);         g.drawOval(100,100,50,50);         break;      case 1:         g.clearRect(100,100,50,50);         g.drawRect(100,100,50,50);         break;      case 2:         g.clearRect(100,100,50,50);         g.drawArc(100,100,50,50,0,140);         break;    }  }}