calculator.java~3~

来自「教材管理系统」· JAVA~3~ 代码 · 共 402 行

package bookmanager;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.*;
import javax.swing.border.*;
import java.util.*;

public class ComputerPad extends JFrame
      implements ActionListener
{
NumberButton[] numberButton;
OperationButton[] operationButton;
JButton dotButton,signButton,backspaceButton,
   reciprocalButton, equalButton, clearZeroButton;

JPanel panel;
JTextField resultShow;
String operators[] = {"+", "-", "*", "/" };
LinkedList String dataList;
boolean equalButtonIsPressed = false;




public class NumberButton extends JButton{
   int number;

   public NumberButton(int number){
    super("" + number);
    this.number = number;
    setForeground(Color.blue);
    //setFont(new Font("Serif", Font.BOLD,16));
   }

   public int getNumber(){
    return number;
   }
}

public ComputerPad(){
   super("计算器");
   dataList = new LinkedList<String>();
   numberButton = new NumberButton[10];

   for(int i = 0; i <= 9; i++){
    numberButton[i] = new NumberButton(i);
    numberButton[i].addActionListener(this);
   }

   operationButton = new OperationButton[4];

   for(int i = 0;i < 4; i++){
    operationButton[i] = new OperationButton(operators[i]);
    operationButton[i].addActionListener(this);
   }

   dotButton = new JButton(".");
   signButton = new JButton("+/-");
   equalButton = new JButton("=");
   reciprocalButton = new JButton("1/x");
   backspaceButton = new JButton("退格");
   clearZeroButton = new JButton("C");

   clearZeroButton.setForeground(Color.red);
   backspaceButton.setForeground(Color.red);
   reciprocalButton.setForeground(Color.red);

   equalButton.setForeground(Color.blue);
   signButton.setForeground(Color.blue);
   dotButton.setForeground(Color.blue);

   clearZeroButton.addActionListener(this);
   backspaceButton.addActionListener(this);
   reciprocalButton.addActionListener(this);

   equalButton.addActionListener(this);
   signButton.addActionListener(this);
   dotButton.addActionListener(this);

   resultShow = new JTextField(10);
   resultShow.setHorizontalAlignment(JTextField.RIGHT);
   resultShow.setForeground(Color.blue);
   resultShow.setFont(new Font("TimesRoman", Font.PLAIN, 14));
   resultShow.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));
   resultShow.setBackground(Color.white);
   resultShow.setEditable(false);

   panel = new JPanel();
   panel.setLayout(new GridLayout(4,5));
   //面板中的第一行
   panel.add(numberButton[1]);
   panel.add(numberButton[2]);
   panel.add(numberButton[3]);
   panel.add(operationButton[0]);
   panel.add(clearZeroButton);

   //面板中的第2行
   panel.add(numberButton[4]);
   panel.add(numberButton[5]);
   panel.add(numberButton[6]);
   panel.add(operationButton[1]);
   panel.add(backspaceButton);

   //面板中的第3行
   panel.add(numberButton[7]);
   panel.add(numberButton[8]);
   panel.add(numberButton[9]);
   panel.add(operationButton[2]);
   panel.add(reciprocalButton);

   //面板中的第4行
   panel.add(numberButton[0]);
   panel.add(signButton);
   panel.add(dotButton);
   panel.add(operationButton[3]);
   panel.add(equalButton);

   add(panel, BorderLayout.CENTER);
   add(resultShow, BorderLayout.NORTH);


   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setVisible(true);
   setBounds(100, 50, 340, 180);
   setResizable(false);
   validate();

}


public class OperationButton extends JButton {
   String operator;

   public OperationButton(String s){
    super(s);
    operator = s;
    setForeground(Color.red);
   }

   public String getOperator(){
    return operator;
   }
}

public void actionPerformed(ActionEvent e) {

   //如果按下的是“数字按钮”
   if(e.getSource() instanceof NumberButton){
    NumberButton b = (NumberButton)e.getSource();
    if(dataList.size() == 0){
     int number = b.getNumber();
     dataList.add("" + number);
     resultShow.setText("" + number);
     equalButtonIsPressed = false;
    }
    else if(dataList.size() == 1 && equalButtonIsPressed == false){
     int number = b.getNumber();
     String num = (String)dataList.getFirst();
     String s = num.concat("" + number);
     dataList.set(0, s);
     resultShow.setText(s);
    }
    else if(dataList.size() == 1 && equalButtonIsPressed == true){
     int number = b.getNumber();
     dataList.removeFirst();
     dataList.add("" + number);
     equalButtonIsPressed = false;
     resultShow.setText("" + number);
    }
    else if(dataList.size() == 2){
     int number = b.getNumber();
     dataList.add("" + number);
     resultShow.setText("" + number);
    }else if(dataList.size() == 3){
     int number = b.getNumber();
     String num = (String)dataList.getLast();
     String s = num.concat("" + number);
     dataList.set(2, s);
     resultShow.setText(s);
    }
   }

   //如果按下的是“各种操作符按钮”
   else if(e.getSource() instanceof OperationButton){
    OperationButton b = (OperationButton)e.getSource();
    if(dataList.size() == 1){
     String fuhao = b.getOperator();

     dataList.add(fuhao);
    }
    else if(dataList.size() == 2){
     String fuhao = b.getOperator();

     dataList.set(1, fuhao);
    }
    else if(dataList.size() == 3){
     String fuhao = b.getOperator();
     String number1 = (String)dataList.getFirst();
     String number2 = (String)dataList.getLast();
     String operator = (String)dataList.get(1);

     //try{
      double n1 = Double.parseDouble(number1);
      double n2 = Double.parseDouble(number2);
      double n = 0;

      if(operator.equals("+")){
       n = n1 + n2;
      }
      else if(operator.equals("-")){
       n = n1 - n2;
      }
      else if(operator.equals("*")){
       n = n1 * n2;
      }
      else if(operator.equals("/")){
       n = n1 / n2;
      }

      dataList.clear();
      dataList.add("" + n);
      dataList.add(fuhao);
      resultShow.setText("" + n);
//     }
//     catch(Exception ee){
//
//     }

    }
   }

   //如果按下的是“等号按钮”
   else if(e.getSource() == equalButton){
    equalButtonIsPressed = true;
    if(dataList.size() == 1 || dataList.size() == 2){
     String num = (String)dataList.getFirst();
     String operator = (String)dataList.get(1);

     double n = Double.parseDouble(num);

     if(operator.equals("+")){
      n = n + n;
     }
     else if(operator.equals("-")){
      n = n - n;
     }
     else if(operator.equals("*")){
      n = n * n;
     }
     else if(operator.equals("/")){
      n = n / n;
     }
     resultShow.setText("" + n);
     dataList.clear();
     dataList.add("" + n);
    }
    else if(dataList.size() == 3){
     String number1 = (String)dataList.getFirst();
     String number2 = (String)dataList.getLast();
     String operator = (String)dataList.get(1);

     try{
      double n1 = Double.parseDouble(number1);
      double n2 = Double.parseDouble(number2);
      double n = 0;

      if(operator.equals("+")){
       n = n1 + n2;
      }
      else if(operator.equals("-")){
       n = n1 - n2;
      }
      else if(operator.equals("*")){
       n = n1 * n2;
      }
      else if(operator.equals("/")){
       n = n1 / n2;
      }

      resultShow.setText("" + n);
      dataList.set(0, "" + n);
      dataList.removeLast();
      dataList.removeLast();
     }
     catch(Exception ee){

     }
    }
   }

   //如果按下的是“小数点按钮”
   else if(e.getSource() == dotButton){
    if(dataList.size() == 0){
     equalButtonIsPressed = false;
    } else {
     String label = dotButton.getLabel();
     if(dataList.size() == 1){
      String dot = label;
      String num = (String)dataList.getFirst();
      String s = null;

      if(num.indexOf(dot) == -1){
       s = num.concat(dot);
       dataList.set(0, s);
      }
      else{
       s = num;
      }

      dataList.set(0, s);
      resultShow.setText(s);
     }
     else if(dataList.size() == 3){
      String dot = label;
      String num = (String)dataList.getLast();
      String s = null;

      if(num.indexOf(dot) == -1){
       s = num.concat(dot);
       dataList.set(2, s);
      }
      else{
       s = num;
      }

      resultShow.setText(s);
     }
    }
   }

   //如果按下的是“退格按钮”
   else if(e.getSource() == backspaceButton){
    if(dataList.size() == 1){
     String num = (String)dataList.getFirst();
     if(num.length() >= 1){
      num = num.substring(0, num.length() - 1);
     }
    }
    else if(dataList.size() == 3){

    }
   }

   //如果按下的是“正负号按钮”
   else if(e.getSource() == signButton){
    if(dataList.size() == 1){

    }
    else if(dataList.size() == 3){

    }
   }

   //如果按下的是“倒数按钮”
   else if(e.getSource() == reciprocalButton){
    if(dataList.size() == 1 || dataList.size() == 2){
     String number1 = (String)dataList.getFirst();
     try{
      double d = Double.parseDouble(number1);
      d = 1.0 / d;
      String str = String.valueOf(d);
      dataList.set(0, str);
      resultShow.setText(str);
     }
     catch(Exception ee){

     }
    }
    else if(dataList.size() == 3){
     String number2 = (String)dataList.getLast();
     try{
      double d = Double.parseDouble(number2);
      d = 1.0 / d;
      String str = String.valueOf(d);
      dataList.set(0, str);
      resultShow.setText(str);
     }
     catch(Exception ee){

     }
    }
   }

   //如果按下的是“清零按钮”
   else if(e.getSource() == clearZeroButton){
    equalButtonIsPressed = false;
    resultShow.setText("0");
    dataList.clear();
   }
}

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