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    • 要求使用Swing，编程一个计算器，需要具备计算器的基本功能，要求出现组合框

    求用JAVA UNITRA做的，多多益善

    举报该问题
    其他回答
    第1个回答  2010-06-16
    有一个简单的，起步的时候做的，简单点，看看能用吧！

    package com.java.concource;
    import javax.swing.*;
    import java.awt.event.*;
    import java.awt.*;
    import java.util.*;

    @SuppressWarnings("serial")
    public class TestCalculator extends JFrame implements ActionListener{
    private JButton[] jb = new JButton[19];
    private JPanel jp0 = null;
    private JTextField tf = null;
    private StringBuffer sb = null;
    private StringBuffer sB = null;
    private MyStack numberStack = null;
    private MyStack operStack = null;
    private LinkedList<String> ll = null;
    private LinkedList<String> numberList = null;
    private LinkedList<String> operList = null;
    private float str = 0;

    public TestCalculator() {
    super("计算器");
    jp0 = new JPanel();
    jp0.setLayout(new GridLayout(5,3,10,10));

    sb = new StringBuffer("");
    sB = new StringBuffer("");

    for(int i=0;i<10;i++){
    jb[i] = new JButton(String.valueOf(i));
    }
    jb[10] = new JButton("+");
    jb[11] = new JButton("-");
    jb[12] = new JButton("*");
    jb[13] = new JButton("/");
    jb[14] = new JButton("=");
    jb[15] = new JButton(".");
    jb[16] = new JButton("C");
    jb[17] = new JButton("Del");
    jb[18] = new JButton("Esc");

    this.setLayout(new BorderLayout());

    for(JButton o : jb){
    o.addActionListener(this);
    jp0.add(o);
    }
    this.add(jp0,BorderLayout.CENTER);

    tf = new JTextField();
    tf.setBackground(Color.PINK);
    tf.setText("");
    tf.setEditable(false);
    this.add(tf,BorderLayout.SOUTH);

    this.addWindowListener(new WindowAdapter(){
    public void windowClosing(WindowEvent e){
    System.exit(0);
    }
    });

    this.setSize(300, 300);
    this.setVisible(true);
    this.validate();
    }

    public void actionPerformed(ActionEvent e){
    if(sb.toString().indexOf("Error")!=-1){
    sb = new StringBuffer("");
    tf.setText(sb.toString());
    }

    if(sb.toString().indexOf("=")!=-1){
    sb = new StringBuffer("");
    sb.append(String.valueOf(str));

    tf.setText(sb.toString());
    }

    if(e.getSource()==jb[17]){
    if(sb.toString()==null)
    tf.setText("");
    sb.deleteCharAt(sb.length()-1);
    tf.setText(sb.toString());
    }
    else if(e.getSource()==jb[18]){
    System.exit(0);
    }
    else if(e.getSource()==jb[16]){
    sb = new StringBuffer("");
    tf.setText("");

    numberList = null;
    }
    else if(e.getSource()!=jb[14]){
    JButton j = (JButton)e.getSource();
    String str = j.getText();
    sb.append(str);
    tf.setText(sb.toString());
    }
    else{
    char[] op = {'+','-','*','/','.'};
    for(char c : op){
    if(sb.toString().startsWith(String.valueOf(c)) || sb.toString().endsWith(String.valueOf(c))){
    sb.append(" " + "Error:格式错误!");
    tf.setText(sb.toString());
    return;
    }
    }
    String[] st = {"+-","-+","+*","*+","+/","/+","-*","*-","-/","/-","*/","/*","++","--","**","//","..",".+",".*",".-","./","+.","-.","*.","/."};
    for(String o : st){
    if(sb.toString().indexOf(o)!=-1){
    sb.append(" " + "Error:格式错误!");
    tf.setText(sb.toString());
    return;
    }
    }

    numberStack = new MyStack();
    operStack = new MyStack();
    ll = new LinkedList<String>();

    sb.append("=");
    char[] number = {'0','1','2','3','4','5','6','7','8','9','.'};
    char[] oper = {'+','-','*','/','='};
    char[] c = sb.toString().toCharArray();
    @SuppressWarnings("unused")
    boolean flag = false;

    for(int i=0;i<c.length;i++){
    int index = numberStack.size();

    for(char o : number){
    if(c[i]==o){
    sB.append(String.valueOf(o));
    break;
    }
    }
    if(numberStack.size()>index)
    continue;

    for(char o : oper){
    if(c[i]==o){
    flag = true;
    ll.addLast(sB.toString());
    sB = new StringBuffer("");
    ll.addLast(String.valueOf(o));
    break;
    }
    }
    }

    while(ll.size()!=0){
    String str = ll.removeFirst();
    if(str.equals("+") || str.equals("-") || str.equals("*") || str.equals("/")){
    if(str.equals("+")){
    operStack.push(str);
    }
    else if(str.equals("-")){
    operStack.push(str);
    }
    else if(str.equals("*")){
    double var0 = Double.valueOf(ll.removeFirst());
    double var1 = Double.valueOf(numberStack.pop());
    double var = var0*var1;
    numberStack.push(String.valueOf(var));
    }
    else if(str.equals("/")){
    double var0 = Double.valueOf(ll.removeFirst());
    double var1 = Double.valueOf(numberStack.pop());
    double var = var1/var0;
    numberStack.push(String.valueOf(var));
    }
    }
    else{
    numberStack.push(str);
    }
    }

    numberList = numberStack.getString();
    operList = operStack.getString();

    while(operList.size()!=0){
    double var0 = Double.valueOf(numberList.removeFirst());
    double var1 = Double.valueOf(numberList.removeFirst());
    double var = 0;
    String opera = operList.removeFirst();

    if(opera.equals("+")){
    var = var0+var1;
    }
    else{
    var = var0-var1;
    }
    numberList.addFirst(String.valueOf(var));
    }

    str = new Double(numberList.removeFirst()).floatValue();
    sb.append(str);
    tf.setText(sb.toString());
    operList = null;
    numberList = null;
    numberStack = null;
    operStack = null;
    ll = null;
    return;
    }
    }

    public static void main(String[] args) {
    new TestCalculator();
    }
    }

    用的是JDK1.6
    第2个回答  2010-06-17

    import java.awt.*;

    import javax.swing.*;

    import java.awt.event.*;

    public class MathCalc extends JFrame{

     

     JTextField textDisplay; 

     public String [] name={"1","2","3","4","5","6","7","8","9","0",".","c","+","-","*","/","1/x","+/-","="};

     JButton [] button=new JButton[name.length];

     JButton btn;

     double Operand1;

     double result=0;

     boolean ClearDisplay;

     String Operator;

     public MathCalc(){

      textDisplay=new JTextField(20);

      for(int i=0;i<name.length;i++)

       button[i]=new JButton(name[i]);

      for(int i=0;i<name.length-1;i++)

       button[i].setPreferredSize(new Dimension(52,28));

       button[18].setPreferredSize(new Dimension(105,28));

      layoutComponents();                //加入按钮

      registerEventHander();          //按钮注册事件监听程序

      setTitle("计算器");

      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      pack();

      setVisible(true);

     }

     

     private void layoutComponents(){        //布局按钮面板

      Container contentPane=getContentPane();

      contentPane.setLayout(new GridLayout(5,1));

      JPanel TextPane=new JPanel();

      TextPane.add(textDisplay);

      JPanel buttonPane0 = new JPanel();

      JPanel buttonPane1 = new JPanel();

      JPanel buttonPane2 = new JPanel();

      JPanel buttonPane3 = new JPanel();

      for(int i=0;i<=2;i++)

      {

       buttonPane0.add(button[i]);

       buttonPane0.add(button[10]);

       buttonPane0.add(button[11]);

      }

       

      for(int i=3;i<=5;i++)

      {

       buttonPane1.add(button[i]);

       buttonPane1.add(button[12]);

       buttonPane1.add(button[13]);

      }

      for(int i=6;i<=8;i++)

      {

       buttonPane2.add(button[i]);

       buttonPane2.add(button[14]);

       buttonPane2.add(button[15]);

      }

       buttonPane3.add(button[9]);

       buttonPane3.add(button[16]);

       buttonPane3.add(button[17]);

       buttonPane3.add(button[18]);

      

       contentPane.add(TextPane);

       contentPane.add(buttonPane0);

       contentPane.add(buttonPane1);

       contentPane.add(buttonPane2);

       contentPane.add(buttonPane3);

     }

     public static void main(String args[]){       //main函数

      JFrame.setDefaultLookAndFeelDecorated(true);

      MathCalc mathcal=new MathCalc();

      mathcal.setVisible(true);

     }

     private void registerEventHander(){            //注册数字按钮事件

      btnNumberEventHander number=new btnNumberEventHander();

      for(int i=0;i<=10;i++)

       button[i].addActionListener(number);

      btnAlcEventHander alc=new btnAlcEventHander();      //运算符按钮注册事件监听程序

      for(int i=12;i<=15;i++)          

       button[i].addActionListener(alc);

      btnAccessEventHander access=new btnAccessEventHander();      //注册“=”的监听事件

      button[18].addActionListener(access);

      btnAcEventHander clear=new btnAcEventHander();               //注册清零键按钮事件

      button[11].addActionListener(clear);

      btnChangeEventHander change= new btnChangeEventHander();  //注册“+/-”按钮事件

      button[17].addActionListener(change);     

      btnXEventHander d=new btnXEventHander();

      button[16].addActionListener(d);        //注册1/x键按钮事件

     }

     

     private class btnNumberEventHander implements ActionListener{   //数字按钮事件

      public void actionPerformed(ActionEvent e){

       JButton btn=(JButton)e.getSource();

       if(ClearDisplay){

        textDisplay.setText("");

        ClearDisplay=false;

       }

       int n=countdot(textDisplay.getText());

       if(btn.getText()==".")

       {

        if(textDisplay.getText().equals("")||n==1)      //处理多个小数点问题   

         JOptionPane.showMessageDialog(null, "不能有多个小数点，小数点不能放在第一位！");

        else textDisplay.setText(textDisplay.getText()+btn.getText());

       }

       else textDisplay.setText(textDisplay.getText()+btn.getText());

      }

     }

     private class btnAlcEventHander implements ActionListener{  //处理运算符按钮事件

      public void actionPerformed(ActionEvent e){

       JButton btnalc=(JButton)e.getSource();

          Operator=btnalc.getText();

          Operand1=Double.parseDouble(textDisplay.getText());

       textDisplay.setText("");

       } 

     }

     private class btnAccessEventHander implements ActionListener{     //等号（=）事件处理程序

      public void actionPerformed(ActionEvent e){

       double Operand2=Double.parseDouble(textDisplay.getText());

        if(Operator.equals("+"))

         result=Operand1+Operand2;

        else if(Operator.equals("-"))

         result=Operand1-Operand2;

        else if(Operator.equals("*"))

         result=Operand1*Operand2;

        else {

         if(Operand2!=0)

          result=Operand1/Operand2;

         else {

         JOptionPane.showMessageDialog(null, "除数不能为零，结果出错！");

        }

         

       }

        textDisplay.setText(""+result);

        ClearDisplay=true;  

      }

     }

     private class btnAcEventHander implements ActionListener{     //清零键注册事件

      public void actionPerformed(ActionEvent e){

       textDisplay.setText("");

       Operator="";

       Operand1=0;

       result=0;

      }

     }

     private class btnChangeEventHander implements ActionListener{  //"+/-"按钮事件处理程序

      public void actionPerformed(ActionEvent e){

       result=-Double.parseDouble(textDisplay.getText());

       textDisplay.setText(String.valueOf(result));

         }

     }

     private class btnXEventHander implements ActionListener{           //1/x按钮事件处理程序

      public void actionPerformed(ActionEvent e){

       if(textDisplay.getText().equals("0"))

        JOptionPane.showMessageDialog(null, "除数不能为零，请重新输入！");

       else {

        result=1.0/Double.parseDouble(textDisplay.getText());

        textDisplay.setText(String.valueOf(result));

        ClearDisplay=true;

       }

        

      }

     }

     int countdot(String s) {     //处理多个小数点问题函数

      int    count=0;

      for(int i=0;i<s.length();i++)

      {

        char ss=s.charAt(i);

        if(ss=='.')

          count++;    

      }

      return count;  

     }

    }

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