java可键盘输入计算器代码

1、import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.text.DecimalFormat;import j

2、avax.swing.BorderFactory;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class Calculator extends JFrame private JTextF

3、ield tf;private JPanel panel1, panel2, panel3, panel4;/组件private JMenuBar myBar;private JMenu menu1;private JMenuItem editItem1, editItem2;private boolean IfResult = true, flag = false;private String oper = "="private double result = 0;private Num numActionListener;private DecimalFormat df

4、; /格式化十进制数StringBuffer memory=new StringBuffer(20);/M系列 动态存放字符串public Calculator()super("科学计算器");/设置标题栏 df = new DecimalFormat("#.#");/保留四位小数this.setLayout(new BorderLayout(10, 5); /总体布局panel1 = new JPanel(new GridLayout(1, 3, 10, 10);/网格布局管理器panel2 = new JPanel(new GridLayout(5,

5、 6, 5, 5);/5行6列panel3 = new JPanel(new GridLayout(5, 1, 5, 5);panel4 = new JPanel(new BorderLayout(5, 5);/* * 菜单栏 */myBar = new JMenuBar();menu1 = new JMenu("查看");menu1.setFont(new Font("宋体", Font.PLAIN, 12);editItem1 = new JMenuItem("帮助(F)",(int)'F');editItem2

6、= new JMenuItem("开发者信息(M)",(int)'M');editItem1.setFont(new Font("宋体",Font.PLAIN,12);editItem2.setFont(new Font("宋体",Font.PLAIN,12);editItem1.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e)JOptionPane.showMessageDialog(null,"

7、1.CE :清除文本框 2.BackSpace :回删刚输入数字n " + "3.C :删除当前计算 4.MC :清除缓冲区n " + "5.MR :恢复缓冲区的数到文本框 6.MS :将文本框的数存入缓冲区n" + "7.M+ :将文本框值与缓冲区的数相加但不显示结果 8. 1/x :将文本框中的数据为它的倒数n" + "9.sqrt :将文本框中的内容求平方根 10.+/- :负数符号n" + "11.n! :n的阶乘 12.log :求对数n"+ "13.:角度弧度转化

8、 14.sin/cos/tan :三角函数" ); ); editItem2.addActionListener(new ActionListener()public void actionPerformed(ActionEvent e) JOptionPane.showMessageDialog(null,"作者：五班第09小组 李兴上 李辉 苏上超（组长） n " + "本计算器仅供交流使用，如有错误，敬请谅解。n本计算器参考了部分资料。n"););menu1.add(editItem1);menu1.add(editItem2);/菜单

9、myBar.add(menu1);/顶层菜单this.setJMenuBar(myBar);numActionListener = new Num();/实现数字监听 class Key extends JPanel implements KeyListener public void keyPressed(KeyEvent e) public void keyTyped(KeyEvent e) char x=e.getKeyChar(); if(x>='0'&&x<='9') if(IfResult)tf.setText("

10、;");IfResult = false; tf.setText(tf.getText().trim() + Character.toString(x);if(tf.getText().equals("0")tf.setText("0");IfResult = true;flag = true; if (x='+' | x='-' | x='*' | x='/' | x='=') if(flag) IfResult = false; if(IfResult) ope

11、r = Character.toString(x); else getResult(Double.parseDouble(tf.getText(); oper = Character.toString(x); IfResult = true; public void keyReleased(KeyEvent e) /* * 文本域，即为计算器的屏幕显示区域 */tf = new JTextField();tf.setEditable(false);/文本区域不可编辑tf.setBackground(Color.white);/文本区域的背景色tf.setHorizontalAlignment(

12、JTextField.RIGHT);/文字右对齐tf.setText("0");tf.setBorder(BorderFactory.createLineBorder(Color.black);/边框Key sk=new Key(); /键盘监听tf.addKeyListener(sk);init();/对计算器进行初始化/* * 初始化操作 * 添加按钮 */private void init()addButton(panel1, "Backspace", new Clear(), Color.black);addButton(panel1, &quo

13、t;CE", new Clear(), Color.black);addButton(panel1, "C", new Clear(), Color.black);addButton(panel2, "1/x", new Signs(), Color.black);addButton(panel2, "log", new Signs(), Color.black);addButton(panel2, "7", numActionListener, Color.blue);addButton(panel2,

14、 "8", numActionListener, Color.blue);addButton(panel2, "9", numActionListener, Color.blue);addButton(panel2, "÷", new Signs(), Color.black);addButton(panel2, "n!", new Signs(), Color.black);addButton(panel2, "sqrt", new Signs(), Color.black);add

15、Button(panel2, "4", numActionListener, Color.blue);addButton(panel2, "5", numActionListener, Color.blue);addButton(panel2, "6", numActionListener, Color.blue);addButton(panel2, "×", new Signs(), Color.black);addButton(panel2, "sin", new Signs(),

16、 Color.black);addButton(panel2, "x2", new Signs(), Color.black);addButton(panel2, "1", numActionListener, Color.blue);addButton(panel2, "2", numActionListener, Color.blue);addButton(panel2, "3", numActionListener, Color.blue);addButton(panel2, "-", n

17、ew Signs(), Color.black);addButton(panel2, "cos", new Signs(), Color.black);addButton(panel2, "x3", new Signs(), Color.black); addButton(panel2, "-/+", new Clear(), Color.black);addButton(panel2, "0", numActionListener, Color.blue);addButton(panel2, ".&qu

18、ot;, new Dot(), Color.black);addButton(panel2, "+", new Signs(), Color.black);addButton(panel2, "tan", new Signs(), Color.black);addButton(panel2, "%", new Signs(), Color.black);addButton(panel2, "", numActionListener, Color.black);addButton(panel2, "e&qu

19、ot;, numActionListener, Color.black);addButton(panel2, "", new Signs(), Color.black);addButton(panel2, "=", new Signs(), Color.black); JButton bm = new JButton("计算器");bm.setBorder(BorderFactory.createLoweredBevelBorder(); /凹陷bm.setEnabled(false);/按钮不可操作bm.setPreferredSi

20、ze(new Dimension(20, 20);/宽 高panel3.add(bm);/加入按钮addButton(panel3, "MC", new Signs(), Color.black);addButton(panel3, "MR", new Signs(), Color.black);addButton(panel3, "MS", new Signs(), Color.black);addButton(panel3, "M+", new Signs(), Color.black);panel4.add(

21、panel1, BorderLayout.NORTH);panel4.add(panel2, BorderLayout.CENTER);this.add(tf, BorderLayout.NORTH);this.add(panel3, BorderLayout.WEST);this.add(panel4); /*总窗口*/pack(); /正好容纳放置的所有组件this.setResizable(true);/窗口可改变大小this.setLocation(300, 200);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);/关闭 /*

22、* 统一设置按钮的的使用方式 * param panel * param name * param action * param color */private void addButton(JPanel panel, String name, ActionListener action, Color color)JButton bt = new JButton(name);panel.add(bt);/在面板上增加按钮bt.setForeground(color);/设置前景（字体）颜色bt.addActionListener(action);/增加监听事件/* * 计算器的基础操作（+ -

23、 × ÷） * param x */private void getResult (double x)if(oper.equals( "+")result += x;else if(oper.equals("-")result -= x;else if(oper.equals ( "×")result *= x;else if(oper.equals( "÷")result /= x;else if(oper.equals("=")result = x;t

24、f.setText(df.format(result); /文本显示/* * 运算符号的事件监听 */ class Signs implements ActionListenerpublic void actionPerformed(ActionEvent e) /* * 用ActionEvent对象的getActionCommand()方法 * 取得与引发事件对象相关的字符串 */String str = e.getActionCommand();/* sqrt求平方根 */if(str.equals("sqrt") /“equals()”比较字符串中所包含的内容是否相同

25、double i = Double.parseDouble(tf.getText(); /字符转化为doubleif(i>=0)/* * String.valueOf() 转换为字符串 * df.format() 按要求保留四位小数 * Math.sqrt() 求算数平方根 */tf.setText(String.valueOf(df.format(Math.sqrt(i);elsetf.setText("负数不能开平方根");/* log求常用对数 */else if(str.equals("log")double i = Double.pars

26、eDouble(tf.getText();if(i>0)tf.setText(String.valueOf(df.format(Math.log(i);elsetf.setText("负数不能求对数");/*M系列*/ else if(str.equals("MC") String temp = " " memory.replace(0, memory.length(), temp); /replace方法, 第一个参数是要修改的字符串,第二个参数是要替换的字符串,第三个参数是替换成什么样的字符串. else if(str.eq

27、uals("MR") tf.setText(memory.toString(); else if(str.equals("MS") String temp = tf.getText().trim(); memory.replace(0, memory.length(), temp); else if(str.equals("M+") String temp1 = tf.getText().trim(); Double num = Double.parseDouble(temp1); String temp2 = memory.toSt

28、ring(); num += Double.parseDouble(temp2); temp1 = String.valueOf(num); /整形 memory.replace(0, memory.length(), temp1); /* %求百分比 */else if(str.equals("%")tf.setText(df.format(Double.parseDouble(tf.getText() / 100);/* 1/x求倒数 */else if(str.equals("1/x")if(Double.parseDouble(tf.getTex

29、t() = 0)tf.setText("除数不能为零");elsetf.setText(df.format(1 / Double.parseDouble(tf.getText();/* sin求正弦函数 */else if(str.equals("sin")double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format(Math.sin(i);/* cos求余弦函数 */else if(str.equals("cos")double i =

30、Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format(Math.cos(i);/* tan求正切函数 */else if(str.equals("tan")double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format(Math.tan(i);/* n!求阶乘 */else if(str.equals("n!")double i = Double.parseDouble(tf.ge

31、tText();if(i%2=0)|(i%2=1)/判断为整数放进行阶乘操作int j = (int)i;/强制类型转换int result=1;for(int k=1;k<=j;k+)result *= k;tf.setText(String.valueOf(result);elsetf.setText("无法进行阶乘");/* x2求平方 */else if(str.equals("x2")double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format

32、(i*i);/* x3求立方 */else if(str.equals("x3")double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(df.format(i*i*i);/* 角度转换 */* * 将角度值转换成弧度值，方便三角函数的计算 */else if(str.equals("")double i = Double.parseDouble(tf.getText();tf.setText(String.valueOf(i/180*Math.PI);elseif(fla

33、g)IfResult = false;if(IfResult)oper = str;else getResult(Double.parseDouble(tf.getText();oper = str;IfResult = true;/* * 清除按钮的事件监听 */class Clear implements ActionListenerpublic void actionPerformed(ActionEvent e) /* * 用ActionEvent对象的getActionCommand()方法 * 取得与引发事件对象相关的字符串 */String str = e.getActionCommand();if(str = "C")tf.setText("0");IfResult = true;result = 0;else if(str = "-/+")double i = 0 - Double.parseDouble(tf.getText().trim();tf.setText(df.format(i);else if(str = "Backspace")if(Double.parseDoubl