java模仿windows计算器示例
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
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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