计算器

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package com.project.clock;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Calc implementsActionListener{

JTextFieldobjText = new JTextField();

intintOperator = 0;

StringstrBefore = "";

StringstrAfter = "";

StringstrResult = "";

booleanblnFirst = true;

booleanblnResult = false;

booleanblnZero = false;

privatevoid init(){

JFrameobjFrame = new JFrame();

objFrame.setSize(200,280);

objFrame.setResizable(false);

objFrame.setDefaultCloseOperation(3);

objFrame.setLocationRelativeTo(null);

//GridLayoutFlowLayout BorderLayout

objFrame.setLayout(newGridLayout(5,1));

String[]strBtnName ={"1","2","3","+","4","5","6","-","7","8","9","*","0","C","=","/"};

JPanelobjP1 = new JPanel();

JPanelobjP2 = new JPanel();

JPanelobjP3 = new JPanel();

JPanelobjP4 = new JPanel();

JButtonobjBtn;

for(inti=0;i<strBtnName.length;i++){

objBtn= new JButton(strBtnName[i]);

objBtn.addActionListener(this);

if(i<=3){

objP1.add(objBtn);

}elseif(i>=4&&i<=7){

objP2.add(objBtn);

}elseif(i>=8&&i<=11){

objP3.add(objBtn);

}elseif(i>=12&&i<=15){

objP4.add(objBtn);

}

objFrame.add(objText);

objFrame.add(objP1);

objFrame.add(objP2);

objFrame.add(objP3);

objFrame.add(objP4);

objFrame.setVisible(true);

}

publicstatic void main(String[] args) {

//TODO Auto-generated method stub

newCalc().init();

}

privatevoid continueOperator(){

if(blnFirst){

blnFirst= false;

strBefore= objText.getText();

objText.setText("");

}else{

if(!blnResult){

strAfter= objText.getText();

}

if(!strBefore.equals("")&&!strAfter.equals("")){

switch(intOperator){

case1:

strResult= String.valueOf(Integer.parseInt(strBefore) + Integer.parseInt(strAfter));

break;

case2:

strResult= String.valueOf(Integer.parseInt(strBefore) - Integer.parseInt(strAfter));

break;

case3:

strResult= String.valueOf(Integer.parseInt(strBefore) * Integer.parseInt(strAfter));

break;

case4:

strResult= String.valueOf(Integer.parseInt(strBefore) / Integer.parseInt(strAfter));

break;

}

objText.setText(strResult);

blnResult= true;

strBefore= strResult;

strAfter= "";

strResult= "";

}

privatevoid equal(){

if(!blnResult){

strAfter= objText.getText();

}

if(!strBefore.equals("")&&!strAfter.equals("")){

switch(intOperator){

case1:

strResult= String.valueOf(Integer.parseInt(strBefore) + Integer.parseInt(strAfter));

objText.setText(strResult);

blnResult= true;

strBefore= strResult;

strAfter= "";

strResult= "";

blnFirst= true;

break;

case2:

strResult= String.valueOf(Integer.parseInt(strBefore) - Integer.parseInt(strAfter));

objText.setText(strResult);

blnResult= true;

strBefore= strResult;

strAfter= "";

strResult= "";

blnFirst= true;

break;

case3:

strResult= String.valueOf(Integer.parseInt(strBefore) * Integer.parseInt(strAfter));

objText.setText(strResult);

blnResult= true;

strBefore= strResult;

strAfter= "";

strResult= "";

blnFirst= true;

break;

case4:

if(Integer.parseInt(strAfter)!=0){

strResult= String.valueOf(Integer.parseInt(strBefore) / Integer.parseInt(strAfter));

objText.setText(strResult);

blnResult= true;

strBefore= strResult;

strAfter= "";

strResult= "";

blnFirst= true;

}else{

blnZero= true;

blnFirst= true;

objText.setText("");

}

break;

}

@Override

publicvoid actionPerformed(ActionEvent e) {

//TODO Auto-generated method stub

if(e.getActionCommand().charAt(0)>='0'&&e.getActionCommand().charAt(0)<='9'){

if(blnZero){

objText.setText("");

blnZero= false;

}

if(blnResult){

objText.setText("");

blnResult= false;

}

objText.setText(objText.getText().concat(e.getActionCommand()));

}else{

switch(e.getActionCommand().charAt(0)){

case'+':

continueOperator();

intOperator= 1;

break;

case'-':

continueOperator();

intOperator= 2;

break;

case'*':

continueOperator();

intOperator= 3;

break;

case'/':

continueOperator();

intOperator= 4;

break;

case'C':

intOperator= 0;

strBefore= "";

strAfter= "";

strResult= "";

blnFirst= true;

blnResult= false;

blnZero= false;

objText.setText("");

break;

case'=':

equal();

break;

}

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