Swing实现的简易计算器

学习了Swing基础中的基础知识，做了个简易中的简易版计算器，囧……

在退格按钮的事件处理代码块中还存在异常，不过不影响计算，呃……

上代码

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 CounterTest {

private JFrame frame;

private JPanel panel;

private JTextField textfile;

private StringBuffer sb = new StringBuffer("");

private StringBuffer sb1 = new StringBuffer(""); //用来暂时存储第一个数字的数据

private StringBuffer sb2 = new StringBuffer(""); ////用来暂时存储第二个数字的数据

private String countMethod = ""; //用来接收计算方法的字符串

private Double num1; //用来接收第一个数字

private Double num2; //用来接收第二个数字

private double result = 0; //用来接收计算结果

public CounterTest(){

frame = new JFrame("LHY版简易计算器");

panel = new JPanel();

textfile = new JTextField();

frame.setBounds(20, 20, 400, 630);

frame.setResizable(false);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

createPanel();

createNumBar();

}

/**

* 创建计算器面板

*/

public void createPanel(){

frame.add(panel);

panel.setLayout(null);

panel.setBounds(20,20,400, 630);

JButton btnNull = new JButton("欢迎使用");

btnNull.setBounds(0, 100, 100, 100);

panel.add(btnNull);

//退格按钮

JButton btnBack = new JButton("退格");

btnBack.setBounds(100, 100, 100, 100);

panel.add(btnBack);

btnBack.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

Character judge = sb.toString().charAt(sb.length()-1);

try{

sb = sb.deleteCharAt(sb.length()-1);

String str = sb.toString();

textfile.setText(str);

if((judge.equals("+") || judge.equals("-") || judge.equals("*") || judge.equals("/")) == true){

countMethod = "";

return;

}else if(countMethod.length() != 0){

sb2 = sb2.deleteCharAt(sb2.length()-1);

String str2 = sb2.toString();

num2 = Double.parseDouble(str2);

}else if(countMethod.length() == 0){

sb1 = sb1.deleteCharAt(sb1.length()-1);

String str1 = sb1.toString();

num1 = Double.parseDouble(str1);

}

///////////////////////////////////////////////////////

// if(countMethod.length() == 0){

// sb1 = sb1.deleteCharAt(sb1.length()-1);

// String str1 = sb1.toString();

// num1 = Double.parseDouble(str1);

// }else if(countMethod.length() != 0){

// if(judge.equals("+") || judge.equals("-") || judge.equals("*") || judge.equals("/")){

// countMethod = "";

// }else{

// sb2 = sb2.deleteCharAt(sb2.length()-1);

// String str2 = sb2.toString();

// num2 = Double.parseDouble(str2);

// }

// }

////////////////////////////////////////////////////////

}catch(Exception ex){

ex.printStackTrace();

}

}

});

//CE按钮

JButton btnCE = new JButton("CE(清零)");

btnCE.setBounds(200, 100, 100, 100);

panel.add(btnCE);

btnCE.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

createNumBar();

sb = new StringBuffer("");

sb1 = new StringBuffer("");

sb2 = new StringBuffer("");

countMethod = "";

}

});

//C按钮

JButton btnC = new JButton("C");

btnC.setBounds(300, 100, 100, 100);

panel.add(btnC);

//数字7按钮

JButton btn7 = new JButton("7");

btn7.setBounds(0, 200, 100, 100);

panel.add(btn7);

btn7.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("7");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("7");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("7");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//数字8按钮

JButton btn8 = new JButton("8");

btn8.setBounds(100, 200, 100, 100);

panel.add(btn8);

btn8.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("8");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("8");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("8");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//数字9按钮

JButton btn9 = new JButton("9");

btn9.setBounds(200, 200, 100, 100);

panel.add(btn9);

btn9.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("9");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("9");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("9");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//除号按钮

JButton btnDivision = new JButton("/");

btnDivision.setBounds(300, 200, 100, 100);

panel.add(btnDivision);

btnDivision.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

countMethod = "/";

sb.append("/");

String str = sb.toString();

textfile.setText(str);

}

});

//数字4按钮

JButton btn4 = new JButton("4");

btn4.setBounds(0, 300, 100, 100);

panel.add(btn4);

btn4.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("4");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("4");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("4");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//数字5按钮

JButton btn5 = new JButton("5");

btn5.setBounds(100, 300, 100, 100);

panel.add(btn5);

btn5.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("5");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("5");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("5");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//数字6按钮

JButton btn6 = new JButton("6");

btn6.setBounds(200, 300, 100, 100);

panel.add(btn6);

btn6.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("6");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("6");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("6");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//乘号按钮

JButton btnMult = new JButton("*");

btnMult.setBounds(300, 300, 100, 100);

panel.add(btnMult);

btnMult.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

countMethod = "*";

sb.append("*");

String str = sb.toString();

textfile.setText(str);

}

});

//数字1按钮

JButton btn1 = new JButton("1");

btn1.setBounds(0, 400, 100, 100);

panel.add(btn1);

btn1.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("1");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("1");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("1");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//数字2按钮

JButton btn2 = new JButton("2");

btn2.setBounds(100, 400, 100, 100);

panel.add(btn2);

btn2.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("2");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("2");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("2");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//数字3按钮

JButton btn3 = new JButton("3");

btn3.setBounds(200, 400, 100, 100);

panel.add(btn3);

btn3.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("3");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("3");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("3");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//减号按钮

JButton btnSub = new JButton("-");

btnSub.setBounds(300, 400, 100, 100);

panel.add(btnSub);

btnSub.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

countMethod = "-";

sb.append("-");

String str = sb.toString();

textfile.setText(str);

}

});

//数字0按钮

JButton btn0 = new JButton("0");

btn0.setBounds(0, 500, 100, 100);

panel.add(btn0);

btn0.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append("0");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append("0");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append("0");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//小数点按钮

JButton btnDot = new JButton(".");

btnDot.setBounds(100, 500, 100, 100);

panel.add(btnDot);

btnDot.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

sb.append(".");

String str = sb.toString();

textfile.setText(str);

if(countMethod.length() == 0){

sb1.append(".");

num1 = Double.parseDouble(sb1.toString());

}else if(countMethod.length() != 0){

sb2.append(".");

num2 = Double.parseDouble(sb2.toString());

}

}

});

//等号按钮

JButton btnEqual = new JButton("=");

btnEqual.setBounds(200, 500, 100, 100);

panel.add(btnEqual);

btnEqual.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

countNum();

}

});

//加号按钮

JButton btnAdd = new JButton("+");

btnAdd.setBounds(300, 500, 100, 100);

panel.add(btnAdd);

btnAdd.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

countMethod = "+";

sb.append("+");

String str = sb.toString();

textfile.setText(str);

}

});

}

/**

* 创建计算器显示条

*/

public void createNumBar(){

textfile.setText("");

textfile.setBounds(0, 0, 400, 100);

panel.add(textfile);

}

/**

* 进行计算的方法

*/

public void countNum(){

if(countMethod.equals("+")){

addMethod();

}else if(countMethod.equals("-")){

subMethod();

}else if(countMethod.equals("*")){

multMethod();

}else if(countMethod.equals("/")){

divisionMethod();

}else{

///////////////////////////////////////

}

}

/**

* 加法

*/

public void addMethod(){

result = num1 + num2;

sb.append("=").append(result);

String str = sb.toString();

textfile.setText(str);

}

/**

* 减法

*/

public void subMethod(){

result = num1 - num2;

sb.append("=").append(result);

String str = sb.toString();

textfile.setText(str);

}

/**

* 乘法

*/

public void multMethod(){

result = num1 * num2;

sb.append("=").append(result);

String str = sb.toString();

textfile.setText(str);

}

/**

* 除法

*/

public void divisionMethod(){

result = num1 / num2;

sb.append("=").append(result);

String str = sb.toString();

textfile.setText(str);

}

public static void main(String[] args) {

new CounterTest();

}

}