java窗口的实现---计算器(算加法)

类别:Java 点击:0 评论:0 推荐:

/***********************************************************************
 * Module:  Caculater.java
 * Author:  Administrator
 * Created: 2004-12-7 23:48:21
 * Purpose:
 ***********************************************************************/
package org.heixue.test.applet;

/**
 * @author Administrator
 */
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Calculater extends JApplet {
 JMenu[] menus = { new JMenu("选项"),new JMenu("关于")};
 JMenuItem[] items = {new JMenuItem("关于"),new JMenuItem("设置背景色") };
 JButton b1 = new JButton("运算");
 JOptionPane b2 = new JOptionPane("运算...");
 JTextField txt1 = new JTextField("100",10);
 JTextField txt2 = new JTextField("200",10);
 JTextField txt3 = new JTextField(20);
 JLabel[] label = {new JLabel("+"),new JLabel("=")};
 JColorChooser jcc = new JColorChooser();
 
 ActionListener al = new ActionListener() {
  public void actionPerformed(ActionEvent e){
   //String name = ((JButton)e.getSource()).getText();
   int m = JOptionPane.showConfirmDialog(null, "继续进行运算吗?", "确定",JOptionPane.YES_NO_OPTION);
   if(m==0){
    String op1 = txt1.getText();
    String op2 = txt2.getText();
    txt3.setText(bussiness(op1,op2));
    //txt3.setText(m+"");
   }
  }
 };
 ActionListener al2 = new ActionListener() {
  public void actionPerformed(ActionEvent e){
   JOptionPane.showMessageDialog(null, "作者:黑雪小组", "关于...",JOptionPane.INFORMATION_MESSAGE);
  }
 };
 ActionListener al3 = new ActionListener() {
  public void actionPerformed(ActionEvent e){
   
   JColorChooser.createDialog(null,"背景色...",true,jcc,al4,null).show();
  }
 };
 ActionListener al4 = new ActionListener() {
  public void actionPerformed(ActionEvent e){
   changeFace(0,jcc.getColor());
  }
 };
 public void init() {
  //initialize layout.
  Container cp = getContentPane();
  cp.setLayout(new FlowLayout());
  //set menu bar.
  menus[0].add(items[1]);
  items[1].addActionListener(al3);
  menus[1].add(items[0]);
  items[0].addActionListener(al2);
  JMenuBar mb = new JMenuBar();
  for(int i = 0; i < menus.length; i++)
   mb.add(menus[i]);
  setJMenuBar(mb);
  
  //add 3 JTextfield.
  cp.add(txt1);
  cp.add(label[0]);
  cp.add(txt2);
  cp.add(label[1]);
  cp.add(txt3);
  
  //add 1 button with JOptionPane
  cp.add(b1);
  b1.addActionListener(al);
 }
 void changeFace(int i,Object o){
  if(i==0){
   //设置背景色
   this.getContentPane().setBackground((Color)o);
   //setBackground((Color)o);  
  }
 }
 String bussiness(String op1,String op2){
  int result=0;
  int op11=0;
  int op21=0;
  try{
   op11=Integer.parseInt(op1);
  }catch(Exception e1){
    
  }
  try{
   op21=Integer.parseInt(op2);
  }catch(Exception e1){
    
  }
  result=op11+op21;
  return ""+result;
 }
 public static void main(String[] args) {
  JApplet applet = new Calculater();
  JFrame frame = new JFrame("计算器");
  // To close the application:
  //Console.setupClosing(frame);
  frame.getContentPane().add(applet);
  frame.setSize(260,140);
  applet.init();
  applet.start();
  frame.setVisible(true);
 }
} ///:~

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