java模仿windows计算器示例_Java教程-查字典教程网
java模仿windows计算器示例
java模仿windows计算器示例
发布时间:2017-01-07 来源:查字典编辑
摘要:这个计算器的界面模仿Windows自带的简易计算器,包括交互界面和和对各种输入的响应。目前尚未实现菜单栏和记忆类按钮的功能复制代码代码如下:...

这个计算器的界面模仿Windows自带的简易计算器,包括交互界面和和对各种输入的响应。目前尚未实现菜单栏和记忆类按钮的功能

复制代码 代码如下:

import java.awt.Color;

import java.awt.Container;

import java.awt.GridLayout;

import java.awt.Insets;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JFrame;

import javax.swing.JButton;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

import javax.swing.plaf.basic.BasicBorders;

public class Calculator extends JFrame {

private static final long serialVersionUID = 1L;

Container c = getContentPane();

StringBuilder number1 = new StringBuilder("");// 储存第1个数字字符串

StringBuilder number2 = new StringBuilder("");// 储存第2个数字字符串

StringBuilder operator = new StringBuilder("");// 储存运算符

StringBuilder result = new StringBuilder("");// 储存运算结果

JTextField numbershow = new JTextField("0.");// 数字显示区域,初始显示为"0."

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

Calculator c1 = new Calculator();

c1.setVisible(true);

}

public Calculator() {// 计算器构造方法

setTitle("计算器");

setBounds(100, 100, 260, 245);

setResizable(false);

setLayout(null);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

createMenuBar();// 创建菜单栏

createNumberShow();// 创建数字显示区域

createMemoShow();// 创建记忆显示

createClearButtons();// 创建Backspace,CE,C等三个按钮

createButtonArea();// 创建数字按钮区域

}

private void createMenuBar() {// 创建菜单栏的方法

JMenuBar menubar = new JMenuBar();

setJMenuBar(menubar);

JMenu menu1 = new JMenu("编辑");

JMenu menu2 = new JMenu("查看");

JMenu menu3 = new JMenu("帮助");

menubar.add(menu1);

menubar.add(menu2);

menubar.add(menu3);

JMenuItem menu1item1 = new JMenuItem("复制");

JMenuItem menu1item2 = new JMenuItem("粘贴");

JMenuItem menu2item1 = new JMenuItem("标准型");

JMenuItem menu2item2 = new JMenuItem("科学型");

JMenuItem menu2item3 = new JMenuItem("科学分组");

JMenuItem menu3item1 = new JMenuItem("帮助主题");

JMenuItem menu3item2 = new JMenuItem("关于计算器");

menu1.add(menu1item1);

menu1.add(menu1item2);

menu2.add(menu2item1);

menu2.add(menu2item2);

menu2.add(menu2item3);

menu3.add(menu3item1);

menu3.add(menu3item2);

}

private void createNumberShow() {// 创建数字显示区域的方法

numbershow.setHorizontalAlignment(JTextField.RIGHT);

numbershow.setBounds(5, 0, 245, 22);

numbershow.setEnabled(false);

numbershow.setDisabledTextColor(Color.BLACK);

c.add(numbershow);

}

private void createMemoShow() {// 创建记忆显示的方法

JTextField memoshow = new JTextField();

memoshow.setEditable(false);

memoshow.setBounds(10, 30, 28, 22);

memoshow.setBorder(new BasicBorders.FieldBorder(Color.black,

Color.black, Color.white, Color.white));

c.add(memoshow);

}

private void createClearButtons() {// 创建Backspace,CE,C等三个按钮的方法

JButton[] clearbutton = new JButton[3];

String[] clearbuttontext = { "Backspace", "CE", "C" };

for (int i = 0; i < 3; i++) {

clearbutton[i] = new JButton();

clearbutton[i].setText(clearbuttontext[i]);

clearbutton[i].setHorizontalAlignment(SwingConstants.CENTER);

clearbutton[i].setMargin(new Insets(0, 0, 0, 0));

clearbutton[i].setFont(new java.awt.Font("Arial", 0, 9));

clearbutton[i].setForeground(Color.blue);

clearbutton[i].setBounds(48 + i * 68, 30, 63, 22);

clearbutton[i].setForeground(Color.red);

c.add(clearbutton[i]);

}

clearbutton[0].addActionListener(new ActionListener() {// 为Backspace按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (number1.toString().equals("")) {// 如果未做任何输入

showNumber(numbershow, number1);// 显示number1

} else if (operator.toString().equals("")) {// 如果只输入了number1

number1.deleteCharAt(number1.toString().length() - 1);// 将number1的最后一个字符去掉

showNumber(numbershow, number1);// 显示number1

} else if (number2.toString().equals("")) {// 如果只输入了number1和operator

showNumber(numbershow, number1);// 不作任何处理,显示number1

} else {// 如果输入了number1、operator、number2

number2.deleteCharAt(number2.toString().length() - 1);// 将number2的最后一个字符去掉

showNumber(numbershow, number2);// 显示number2

}

}

});

clearbutton[1].addActionListener(new ActionListener() {// 为CE按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (number1.toString().equals("")) {// 如果未做任何输入

showNumber(numbershow, number1);// 显示number1

} else if (operator.toString().equals("")) {// 如果只输入了number1

number1.setLength(0);// 清除number1

showNumber(numbershow, number1);// 显示number1

} else if (number2.toString().equals("")) {// 如果输入了number1和operator

showNumber(numbershow, number2);// 不作任何处理,显示number2

} else {// 如果输入了number1、operator、number2

number2.setLength(0);// 清除number2

showNumber(numbershow, number2);// 显示number2

}

}

});

clearbutton[2].addActionListener(new ActionListener() {// 为C按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {// 将所有储存清零

number1.setLength(0);

number2.setLength(0);

operator.setLength(0);

numbershow.setText("0.");

result.setLength(0);

}

});

}

private void createButtonArea() {// 创建数字按钮区域的方法

JPanel ButtonArea = new JPanel();

ButtonArea.setBounds(5, 55, 245, 125);

ButtonArea.setLayout(new GridLayout(4, 6, 5, 5));

c.add(ButtonArea);

JButton[] numberbutton = new JButton[24];

String[] numberbuttontext = { "MC", "7", "8", "9", "/", "sqrt", "MR",

"4", "5", "6", "*", "%", "MS", "1", "2", "3", "-", "1/X", "M+",

"0", "+/-", ".", "+", "=" };

for (int i = 0; i < 24; i++) {// 使用循环为这24个按钮添加标识

numberbutton[i] = new JButton(numberbuttontext[i]);

ButtonArea.add(numberbutton[i]);

if (i % 6 == 0 || i % 6 == 4 || i == 23) {// 操作符按钮设置为红色

numberbutton[i].setHorizontalAlignment(SwingConstants.CENTER);

numberbutton[i].setMargin(new Insets(0, 0, 0, 0));

numberbutton[i].setFont(new java.awt.Font("Arial", 0, 9));

numberbutton[i].setForeground(Color.red);

} else {// 其它设置为蓝色

numberbutton[i].setHorizontalAlignment(SwingConstants.CENTER);

numberbutton[i].setMargin(new Insets(0, 0, 0, 0));

numberbutton[i].setFont(new java.awt.Font("Arial", 0, 9));

numberbutton[i].setForeground(Color.blue);

}

}

int[] numbers = { 19, 13, 14, 15, 7, 8, 9, 1, 2, 3 };// 该数组中的数字分别代表0-9等数字在numberbuttontext数组中序号

for (int i = 0; i <= 9; i++) { // 使用循环为这0-9这十个数字按钮添加监听器

final String str = String.valueOf(i);

numberbutton[numbers[i]].addActionListener(new ActionListener() {// 为0-9按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (operator.toString().equals("")) {// 没有输入operator之前

add(number1, str); // 只设置number1的值

showNumber(numbershow, number1);// 只显示number1的值

} else {// 输入operator之后

add(number2, str);// 只设置number2的值

showNumber(numbershow, number2);// 只显示number2的值

}

}

});

}

numberbutton[20].addActionListener(new ActionListener() { // 为"+/-"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (operator.toString().equals("")) {// 没有输入operator之前

add(number1, "+/-");// 只设置number1的值

showNumber(numbershow, number1);// 只显示number1的值

} else {// 输入operator之后

add(number2, "+/-");// 只设置number2的值

showNumber(numbershow, number2);// 只显示number2的值

}

}

});

numberbutton[21].addActionListener(new ActionListener() { // 为"."按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (operator.toString().equals("")) {// 在输入operator之前,只显示number1的值

add(number1, ".");

showNumber(numbershow, number1);

} else {// 在输入operator之后,只显示number2的值

add(number2, ".");

showNumber(numbershow, number2);

}

}

});

numberbutton[22].addActionListener(new ActionListener() { // 为"+"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

operator.setLength(0);

operator.append("+");

}

});

numberbutton[16].addActionListener(new ActionListener() { // 为"-"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

operator.setLength(0);

operator.append("-");

}

});

numberbutton[10].addActionListener(new ActionListener() { // 为"*"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

operator.setLength(0);

operator.append("*");

}

});

numberbutton[4].addActionListener(new ActionListener() { // 为"/"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

operator.setLength(0);

operator.append("/");

}

});

numberbutton[23].addActionListener(new ActionListener() { // 为"="按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (number1.toString().equals("")) {// 当number1为空时

showNumber(numbershow, number1);

} else if (operator.toString().equals("")) {// 当number1不为空,而operator为空时

showNumber(numbershow, number1);

} else if (number2.toString().equals("")) {// 当number1、operator均不为空,而number2为空时

switch (operator.toString()) {

case ("+"): {

number2.append(number1.toString());

double d = Double.parseDouble(number1

.toString())

+ Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

case ("-"): {

number2.append(number1.toString());

double d = Double.parseDouble(number1

.toString())

- Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

case ("*"): {

number2.append(number1.toString());

double d = Double.parseDouble(number1

.toString())

* Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

case ("/"): {

number2.append(number1.toString());

double d = Double.parseDouble(number1

.toString())

/ Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

}

} else {// 当number1、operator、number2均不为空时

switch (operator.toString()) {

case ("+"): {

double d = Double.parseDouble(number1

.toString())

+ Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

case ("-"): {

double d = Double.parseDouble(number1

.toString())

- Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

case ("*"): {

double d = Double.parseDouble(number1

.toString())

* Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

case ("/"): {

double d = Double.parseDouble(number1

.toString())

/ Double.parseDouble(number2.toString());

result.setLength(0);

result.append(d);

showNumber(numbershow, result);

number1.setLength(0);

number1.append(d);

}

break;

}

}

}

});

numberbutton[17].addActionListener(new ActionListener() { // 为"1/x"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (number1.toString().equals("")) {// 没有输入number1时

numbershow.setText("除数不能为零");

} else if (operator.toString().equals("")) {// 输入了number1,但没有输入operator

if (Double.parseDouble(number1.toString()) == 0) {// 如果number1的值为零

numbershow.setText("除数不能为零");

} else {// 如果number1的值不为零

double d = 1 / (Double.parseDouble(number1

.toString()));

number1.setLength(0);

number1.append(d);// 将number1的值开放并存储

showNumber(numbershow, number1);

}

} else if (number2.toString().equals("")) {// 输入了number1、operator,但没有输入number2

double d = 1 / (Double.parseDouble(number1

.toString()));

number2.append(d);// 将number1的值开放并存储

showNumber(numbershow, number2);

} else {// 输入了number1、operator,number2

double d = 1 / (Double.parseDouble(number2

.toString()));

number2.setLength(0);

number2.append(d);// 将number2的值开放并存储

showNumber(numbershow, number2);

}

}

});

numberbutton[11].addActionListener(new ActionListener() { // 为"%"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

// 暂时空缺

}

});

numberbutton[5].addActionListener(new ActionListener() { // 为"sqrt"按钮添加监听器

@Override

public void actionPerformed(ActionEvent e) {

if (number1.toString().equals("")) {// 没有输入number1时

showNumber(numbershow, number1);

} else if (operator.toString().equals("")) {// 输入了number1,但没有输入operator

if (Double.parseDouble(number1.toString()) < 0) {// number1小于0

numbershow.setText("函数输入无效");

} else {// number1大于0

double d = Math.sqrt(Double.parseDouble(number1

.toString()));

number1.setLength(0);

number1.append(d);// 将number1的值开放并存储

showNumber(numbershow, number1);

}

} else if (number2.toString().equals("")) {// 输入了number1、operator,但没有输入number2

double d = Math.sqrt(Double.parseDouble(number1

.toString()));

number2.append(d);// 将number1的值开放并存储

showNumber(numbershow, number2);

} else {// 输入了number1、operator、number2

double d = Math.sqrt(Double.parseDouble(number2

.toString()));

number2.setLength(0);

number2.append(d);// 将number2的值开放并存储

showNumber(numbershow, number2);

}

}

});

}

public void add(StringBuilder s1, String s2) {// 定义按钮输入后数字字符串变化的方法

if (s2.equals("+/-")) {// 定义输入"+/-"后数字字符串的变化

if (s1.toString().equals("") || s1.toString().equals("0")) {// 如果数字字符串为空或者0,那么不发生变化

s1.append("");

} else {// 如果数字字符串不为空也不为0,那么在数字字符串前增加或删除"-"字符

if (s1.toString().startsWith("-")) {

s1.deleteCharAt(0);

} else {

s1.insert(0, "-");

}

}

}

if (s2.equals(".")) {// 定义输入"."后数字字符串的变化

if (s1.toString().indexOf(".") == -1) {// 查找数字字符串中是否含有"."字符,如果没有则执行以下代码

if (s1.toString().equals("")) {// 如果数字字符串为空,那么将数字字符串设置为"0."

s1.setLength(0);

s1.append("0.");

} else {

s1.append(".");

}

} else {// 如果有,则不发生变化

s1.append("");

}

}

if (s2.equals("0")) {// 定义输入"0"后数字字符串的变化

if (s1.toString().equals("0")) {// 当数字的字符串为"0"时,不发生变化

s1.append("");

} else {// 当数字的字符串吧为"0"时,在其字符串后增加"0"

s1.append("0");

}

}

for (int i = 1; i < 10; i++) {// 通过循环,定义输入1-9后数字字符串的变化

String str = String.valueOf(i);

if (s2.equals(str)) {// 定义输入1-9后数字字符串的变化

if (s1.toString().equals("0")) {

s1.setLength(0);

s1.append(str);

} else

s1.append(str);

}

}

}

public void showNumber(JTextField j, StringBuilder s) {// 定义数字显示区域如何显示数字字符串的方法

if (s.toString().equals("") == true || s.toString().equals("0") == true) {

j.setText("0.");

} else if (s.toString().indexOf(".") == -1) {

j.setText(s.toString() + ".");

} else {

j.setText(s.toString());

}

}

}

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