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java实现简单的计算器类实例

转载 作者：qq735679552 更新时间：2022-09-29 22:32:09 27 4
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本文实例讲述了java实现简单的计算器类。分享给大家供大家参考。具体如下:

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package chap;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculator {
   private JFrame frame;
   private JPanel panel,panelKeys,panelKeys_up,panelKeys_down;
   private JTextField textComputer; //计算区域
   private JButton buttonBk,buttonC; //退格键和清零键
   private JButton button[]; //数字键组
   private JButton buttonDot,buttonAddSub,buttonAdd,buttonSub,buttonMul,buttonDiv,button1,button2,button3,buttonEqual;
   private double result; //计算结果
   private final short ADD = 1 ;
   private final short SUB = 2 ;
   private final short MUL = 3 ;
   private final short DIV = 4 ;
   private short operator = - 1 ; //运算符
   public Calculator(){
     frame = new JFrame( "计算机" );
     frame.setSize( 400 , 250 );
     panel = new JPanel(); //全局面板
     panel.setVisible( true );
     frame.setVisible( true );
     frame.getContentPane().add(panel);
     ActionListener listener = new ComputerActionListener(); //按键监听器
     //计算区
     textComputer = new JTextField( 15 );
     textComputer.setText( "" );
     textComputer.setEditable( false );
     textComputer.setBackground( new Color( 255 , 255 , 255 ));
     //功能键上半部分
     panelKeys_up = new JPanel();
     panelKeys_up.setLayout( new FlowLayout(FlowLayout.RIGHT));
     buttonBk = new JButton( "Backspace" );
     buttonBk.setForeground( new Color( 255 , 0 , 0 ));
     buttonC = new JButton( "C" );
     buttonC.setForeground( new Color( 255 , 0 , 0 ));
     buttonBk.addActionListener(listener);
     buttonC.addActionListener(listener);
     panelKeys_up.add(buttonBk);
     panelKeys_up.add(buttonC);
     //功能键下半部分
     panelKeys_down = new JPanel();
     panelKeys_down.setLayout( new GridLayout( 4 , 5 ));
     button = new JButton[ 10 ];
     for ( int i = 0 ;i < button.length;i++){
       button[i] = new JButton(Integer.toString(i));
       button[i].setForeground( new Color( 255 , 0 , 0 ));
     }
     buttonAddSub = new JButton( "+/-" );
     buttonAddSub.setForeground( new Color( 255 , 0 , 0 ));
     buttonAdd = new JButton( "+" );
     buttonAdd.setForeground( new Color( 255 , 0 , 0 ));
     buttonSub = new JButton( "-" );
     buttonSub.setForeground( new Color( 255 , 0 , 0 ));
     buttonMul = new JButton( "*" );
     buttonMul.setForeground( new Color( 255 , 0 , 0 ));
     buttonDiv = new JButton( "/" );
     buttonDiv.setForeground( new Color( 255 , 0 , 0 ));
     button1 = new JButton();
     button2 = new JButton();
     button3 = new JButton();
     button1.setForeground( new Color( 255 , 0 , 0 ));
     button2.setForeground( new Color( 255 , 0 , 0 ));
     button3.setForeground( new Color( 255 , 0 , 0 ));
     buttonEqual = new JButton( "=" );
     buttonEqual.setForeground( new Color( 255 , 0 , 0 ));
     buttonAddSub.addActionListener(listener);
     buttonAdd.addActionListener(listener);
     buttonSub.addActionListener(listener);
     buttonMul.addActionListener(listener);
     buttonDiv.addActionListener(listener);
     buttonEqual.addActionListener(listener);
     for ( int i = 0 ; i <= 9 ; i++){
       button[i].addActionListener(listener);
     }
     for ( int i = 0 ; i <= 9 ; i++){
       panelKeys_down.add(button[i]);
     }
     panelKeys_down.add(buttonAddSub);
     panelKeys_down.add(buttonAdd);
     panelKeys_down.add(buttonSub);
     panelKeys_down.add(buttonMul);
     panelKeys_down.add(buttonDiv);
     panelKeys_down.add(buttonEqual);
     panel.setLayout( new BorderLayout());
     panel.add(textComputer,BorderLayout.NORTH);
     panel.add(panelKeys_up,BorderLayout.CENTER);
     panel.add(panelKeys_down,BorderLayout.SOUTH);
   }
   class ComputerActionListener implements ActionListener{
     @Override
     public void actionPerformed(ActionEvent event) {
       // TODO Auto-generated method stub
       Object keyButton = event.getSource();
       String text = textComputer.getText();
       DecimalFormat df = new DecimalFormat( "0.###########" );
       //Backspace
       if (keyButton == buttonBk && text.length() > 0 ){
         textComputer.setText(text.substring( 0 ,text.length()- 1 ));
       }
       //C键
       if (keyButton == buttonC){
         result = 0 ;
         textComputer.setText( "" );
       }
       //数字键
       for ( int i= 0 ;i< 10 ;i++){
         if (keyButton == button[i]){
           textComputer.setText(text+i);
         }
       }
       if (keyButton == buttonAdd){
         operator = 1 ;
       }
       if (keyButton == buttonSub){
         operator = 2 ;
       }
       if (keyButton == buttonMul){
         operator = 3 ;
       }
       if (keyButton == buttonDiv){
         operator = 4 ;
       }
       //符号键
       if (keyButton == buttonAdd || keyButton == buttonSub || keyButton == buttonMul || keyButton == buttonDiv || keyButton == buttonEqual){
         switch (operator){
         case ADD:
           result += Double.parseDouble(text);
           break ;
         case SUB:
           result -=Double.parseDouble(text);
           break ;
         case MUL:
           result *=Double.parseDouble(text);
           break ;
         case DIV:
           result /=Double.parseDouble(text);
           break ;
         default :
           result = Double.parseDouble(text);
         }
         textComputer.setText( "" );
       }
       if (keyButton == buttonEqual){
         textComputer.setText(String.valueOf(result));
       }
     }
   }
   public static void main(String args[]){
     new Calculator();
   }
}

希望本文所述对大家的java程序设计有所帮助.

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