valia.java~15~

很好得jbuilder100例源代码

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("输入数据");
    checkbox1.setLabel("双精度");
    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("转换成");
    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);
      }
  }


}