package untitled1;import java.awt.*;import java.awt.event.*;import java.applet.*;import com.borland.jbcl.layout.*;public class valia extends Applet {  boolean flag = false,flag1 = false,flag2 = false;  double num;  boolean isStandalone = false;  TextField text1 = new TextField();  XYLayout xYLayout1 = new XYLayout();  Label label1 = new Label();  Checkbox checkbox1 = new Checkbox();  Checkbox checkbox2 = new Checkbox();  Label label2 = new Label();  /**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 valia() {  }  /**Initialize the applet*/  public void init() {    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  /**Component initialization*/  private void jbInit() throws Exception {    text1.setFont(new java.awt.Font("Dialog", 0, 16));    text1.setText("0");    text1.addFocusListener(new java.awt.event.FocusAdapter() {      public void focusLost(FocusEvent e) {        text1_focusLost(e);      }    });    this.setLayout(xYLayout1);    label1.setFont(new java.awt.Font("Dialog", 0, 16));    label1.setText("輸入數據");    checkbox1.setLabel("雙精度");    checkbox1.addItemListener(new java.awt.event.ItemListener() {      public void itemStateChanged(ItemEvent e) {        checkbox1_itemStateChanged(e);      }    });    checkbox2.setLabel("整形");    checkbox2.addItemListener(new java.awt.event.ItemListener() {      public void itemStateChanged(ItemEvent e) {        checkbox2_itemStateChanged(e);      }    });    label2.setFont(new java.awt.Font("Dialog", 0, 16));    label2.setText("轉換成");    this.add(text1,    new XYConstraints(156, 70, 80, -1));    this.add(label1,     new XYConstraints(50, 70, 80, -1));    this.add(checkbox1, new XYConstraints(155, 114, 72, 27));    this.add(checkbox2,  new XYConstraints(155, 152, 69, 25));    this.add(label2,  new XYConstraints(50, 110, 83, 27));  }  /**Get Applet information*/  public String getAppletInfo() {    return "Applet Information";  }  /**Get parameter info*/  public String[][] getParameterInfo() {    return null;  }  void checkbox1_itemStateChanged(ItemEvent e) {      if (flag){         if (checkbox1.getState()){             flag1 = true;         }         else             flag1 = false;         repaint();      }  }  void text1_focusLost(FocusEvent e) {      String str = text1.getText() ;      if (str!=null){          try{              num = Double.parseDouble(str);              flag = true;          }          catch(Exception ex){}      }      repaint();  }  void checkbox2_itemStateChanged(ItemEvent e) {      if (flag){         if (checkbox2.getState()){             flag2 = true;         }         else             flag2 = false;         repaint();      }  }  public void paint(Graphics g){      if (flag1 == true){          g.drawString(String.valueOf(num),100,200);      }      if (flag2 == true){          g.drawString(String.valueOf((int)(num)),100,250);      }  }}