From 44ef8c041908e807cccfacef3ea353eba9686d3b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=BE=8A=E9=A9=BC=E6=83=B3=E7=9D=A1=E8=A7=89?= <204532647@qq.com> Date: Sat, 13 Apr 2024 16:58:18 +0800 Subject: [PATCH] =?UTF-8?q?=E5=A4=8F=E6=99=93=E9=9D=99=E5=88=A0=E9=99=A4?= =?UTF-8?q?=E4=B8=8D=E5=BF=85=E8=A6=81=E8=BD=AF=E4=BB=B6?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- src/Calculator.java | 315 -------------------------------------------- 1 file changed, 315 deletions(-) delete mode 100644 src/Calculator.java diff --git a/src/Calculator.java b/src/Calculator.java deleted file mode 100644 index 3da4c96..0000000 --- a/src/Calculator.java +++ /dev/null @@ -1,315 +0,0 @@ -import javax.swing.*; -import java.awt.*; -import java.awt.event.ActionEvent; -import java.awt.event.ActionListener; -import java.text.DecimalFormat; -import java.math.BigInteger; -//时间允许，可通过引入一下包，实现鼠标滑过按钮变色和键盘输入 -//import java.awt.event.MouseAdapter; -//import java.awt.event.MouseEvent; -//import java.awt.event.KeyAdapter; -//import java.awt.event.KeyEvent; -import java.math.BigDecimal;//控制小数点后几位 -import java.awt.* -;@SuppressWarnings("unused") -public class Calculator implements ActionListener { - - private JFrame frame = new JFrame();//界面应用程序，窗口 - - //计算器上各按键的符号 - private String[] keys = {"%", "CE", "C", "←", "n!", "aⁿ", "cos", "sin", "1/x", "x²", "√x", "÷", "7", "8", "9", - "×", "4", "5", "6", "－", "1", "2", "3", "+", "+/-", "0", ".", "="}; - private JButton button[] = new JButton[keys.length]; //计算器上按键的按钮（数组保存） - private JTextField resultText = new JTextField("0");//显示计算结果文本框 - private JTextField processText = new JTextField();//显示计算过程文本框 - private boolean firstDigit = true; // 标志用户按的是否是整个表达式的第一个数字,或者是运算符后的第一个数字 - private double resultNum = 0.0000; // 计算的中间结果 - private String operator = "="; // 当前运算的运算符（按键"C"时需要将其还原为"="） - private boolean operateValidFlag = true; // 判断操作是否合法 - - char charA; - - public Calculator() {//本类Calculator的构造函数 - init(); // 初始化计算器 - - frame.setTitle("计算器"); - frame.setSize(350, 550); - frame.setLocation(500, 300); - frame.setResizable(true); // 允许修改计算器窗口的大小 - frame.setVisible(true); - frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//点击关闭按钮后执行exit退出应用程序 - } - - - private void init() {//初始化变量，创建面板，添加按钮，面板布局 - Color color1 = new Color(181, 181, 181); - Color color2 = new Color(126, 192, 238); //等于号专属颜色 - Color color3 = new Color(232, 232, 232); //背景颜色//功能键和运算符颜色 - Color color4 = new Color(132, 132, 232);//紫色 - - JPanel resultTextPanel = new JPanel();// 建立一个画板放文本框 - resultTextPanel.setLayout(new BorderLayout()); - resultTextPanel.setSize(400, 50); - resultTextPanel.add(resultText); - resultText.setFont(new Font("黑体", Font.BOLD, 55)); //设置文本框中文字的字体以及大小，加粗 - resultText.setHorizontalAlignment(JTextField.RIGHT); //文本框中的内容采用右对齐方式 - resultText.setEditable(false); //不能修改结果文本框 - resultText.setBorder(null); //删除文本框的边框 - resultText.setBackground(color1);// 设置文本框背景颜色 - - JPanel processTextPanel = new JPanel(); - processTextPanel.setLayout(new BorderLayout()); - processTextPanel.setSize(400, 50); - processTextPanel.add(processText); - processText.setFont(new Font("黑体", Font.PLAIN, 25)); //设置文本框中文字的字体以及大小，加粗 - processText.setHorizontalAlignment(JTextField.RIGHT); //文本框中的内容采用右对齐方式 - processText.setEditable(false); //不能修改结果文本框 - processText.setBorder(null); //删除文本框的边框 - - processText.setBackground(color1); - - // 初始化计算器上键的按钮，将键放在一个画板内 - JPanel keysPanel = new JPanel(); - // 用网格布局器，6行，4列的网格，网格之间的水平方向垂直方向间隔均为2个像素 - keysPanel.setLayout(new GridLayout(7, 4, 2, 2)); - - //初始化功能按钮 - for (int i = 0; i < 12; i++) { - button[i] = new JButton(keys[i]); - Dimension preferredSize = new Dimension(95, 50); - button[i].setPreferredSize(preferredSize); - keysPanel.add(button[i]); - button[i].setBackground(color3); - button[i].setForeground(Color.black);//设置字体颜色 - button[i].setFont(new Font(Font.SERIF, Font.PLAIN, 18)); - if (i == 11 || i == 3) button[i].setFont(new Font(Font.SERIF, Font.PLAIN, 30)); - if (i == 1 || i == 2) button[i].setFont(new Font("黑体", Font.PLAIN, 18)); - button[i].setBorderPainted(false); //去除按钮的边框 - } - - //初始化运算符及数字键按钮 - for (int i = 12; i < keys.length; i++) { - button[i] = new JButton(keys[i]); - Dimension preferredSize = new Dimension(95, 50); - button[i].setPreferredSize(preferredSize); - keysPanel.add(button[i]); - if ((i + 1) % 4 == 0) { - button[i].setBackground(color3);//运算符按钮 - button[i].setFont(new Font(Font.SERIF, Font.PLAIN, 30)); - } else { - button[i].setBackground(Color.white);//数字按钮 - button[i].setFont(new Font("黑体", Font.BOLD, 20)); - } - if (i == 19) button[i].setFont(new Font(Font.SERIF, Font.PLAIN, 18)); - button[i].setForeground(Color.black); - - button[i].setBorderPainted(false); //去除按钮的边框 - } - button[27].setBackground(color4); // 用紫色 覆盖更改 标记'=' - - keysPanel.setBackground(color1); - - //将文本框所在的面板放在北部和中部，将keysPanel面板放在计算器的南部 - frame.getContentPane().add("North", processTextPanel); - frame.getContentPane().add("Center", resultTextPanel); - frame.getContentPane().add("South", keysPanel); - processTextPanel.setBorder(BorderFactory.createMatteBorder(25, 3, 0, 3, color1)); - resultTextPanel.setBorder(BorderFactory.createMatteBorder(0, 3, 5, 3, color1)); - keysPanel.setBorder(BorderFactory.createMatteBorder(5, 3, 5, 3, color1)); - - for (int i = 0; i < keys.length;i++){ - button[i].addActionListener(this);//为各按钮添加事件监听器，都使用同一个事件监听器 - } - } - public void actionPerformed(ActionEvent ev){//监听函数，将得到的事件选择对应的函数 - String command = ev.getActionCommand();//获取事件源 - if (command.equals(keys[3])) doBackspace();//用户按了"Back"鍵键 - else if (command.equals(keys[1])) resultText.setText("0");//用户按了"CE"键 - else if (command.equals(keys[2])) doC();//用户按了"C"键 - else if ("0123456789.".indexOf(command)>= 0) doNumber(command);//用户按了数字键 - else if (command.equals(keys[0])||command.equals(keys[4])||command.equals(keys[6]) - ||command.equals(keys[7])|| command.equals(keys[8])||command.equals(keys[9]) - ||command.equals(keys[10]) || command.equals(keys[24])) doOperator1(command); - //用户按了只需一个数的运算键（求倒数，%，开方，平方，取正负数） - else doOperator2(command); -} - private void doBackspace(){//删除鍵 - String text = resultText.getText(); - int i = text.length(); - if (i > 0){ - text = text.substring(0, i - 1);//退格，将文本最后一个字符去掉 - if (text.length()== 0){ - resultText.setText("0");//如果文本没有内容了，则初始化计算器的各种值 - firstDigit = true; - operator ="="; - } else { - resultText.setText(text);//显示新的文本 - } - } - } - - - private void doC(){//清除鍵 - //初始化计算器的各种值 - processText.setText(null); - resultText.setText("0"); - firstDigit = true; - operator ="="; - } - private void doNumber(String key){//得到数字，处理数字 - if (firstDigit){ - //输入的为第一个数 - resultText.setText(null); - resultText.setText(key); - } else if ((key.equals("."))&&(resultText.getText().indexOf(".")<0)){ - } else if ((key.equals("."))&&(resultText.getText().indexOf(".")< 0)){ - //index0f(）返回指定字符在字符串中第一次出现处的索引，如果此字符串中没有这样的字符,则返回-1 - //输入的是小数点，并且之前没有小数点，则将小数点附在结果文本框的后面 - resultText.setText(resultText.getText()+"."); - } else if (!key.equals(".")){//如果输入的不是小数点，则将数字附在结果文本框的后面 - resultText.setText(resultText.getText()+ key); - } - firstDigit=false; - } - private void doOperator1(String key){//进行单目运算 - operator = key;//运算符为用户按的按钮 - if (operator.equals("1/x")){//倒数运算 - if (resultNum == 0){ - operateValidFlag = false;//操作不合法 - resultText.setText("除数不能为零"); - } else { - resultNum = 1 / getNumberFromText(); - processText.setText("1/("+ resultText.getText()+")"); - } - }else if (operator.equals("√x")){//平方根运算 - if (resultNum < 0){ - operateValidFlag = false;//操作不合法 - resultText.setText("无效输入"); - } else { - resultNum = Math.sqrt(getNumberFromText()); - processText.setText("√("+resultText.getText()+")"); - //resultNum=getNumberFromText(); - } - } else if (operator.equals("x²")){//平方运算X - resultNum = getNumberFromText()* getNumberFromText(); - processText.setText("sqr("+ resultText.getText()+")"); - } else if (operator.equals("%")){//百分号运算，除以100 - resultNum = getNumberFromText()/ 100; - } else if (operator.equals("n!")){ - BigInteger num = new BigInteger("1"); - BigInteger flat = new BigInteger("1"); - for (int i = 0; i < getNumberFromText(); i++){ - flat = flat.multiply(num); - num = num.add(new BigInteger("1")); - } - resultNum = flat.floatValue();//BigInteger转换为float - processText.setText("fact("+ resultText.getText()+")"); - } else if (operator.equals("cos")){ - resultNum = Math.cos(getNumberFromText()); - processText.setText("cos("+ resultText.getText()+")"); - } else if (operator.equals("sin")){ - resultNum = Math.sin(getNumberFromText()); - processText.setText("sin("+ resultText.getText()+")"); - } else if (operator.equals("+/-")){//正数负数运算 - resultNum =getNumberFromText()*(-1); - } - isOperateValidFlag(operateValidFlag); - firstDigit = true;//复位 - if (operateValidFlag == false) processText.setText(null); - operateValidFlag = true; - } - - - private void doOperator2(String key){//进行双目运算 - if (operator.equals("÷")){//除法运算//如果当前结果文本框中的值等于0 - if (getNumberFromText()== 0.0){ - operateValidFlag = false;//操作不合法 - resultText.setFont(new Font("黑体", Font.BOLD, 40)); - resultText.setText("除数不能为零"); - //resultText.setFont(new Font("黑体", Font.BOLD, 55)); - } else { - resultNum /= getNumberFromText(); - } - } else if (operator.equals("+")){//加法运算 - resultNum += getNumberFromText(); - } else if (operator.equals("－")){//减法运算 - resultNum -= getNumberFromText(); - } else if (operator.equals("×")){//乘法运算 - resultNum *= getNumberFromText(); - } else if (operator.equals("=")){//赋值运算 - resultNum = getNumberFromText(); - processText.setText(null); - } else if (operator.equals("aⁿ")){ - resultNum = Math.pow(resultNum, getNumberFromText()); - } - if (key.equals("+")|| key.equals("×")|| key.equals("÷")|| key.equals("=")){ - processText.setText(processText.getText()+ resultText.getText()+ key); - } else if (key.equals("－")){ - processText.setText(processText.getText()+ resultText.getText()+"-"); - } else if (key.equals("aⁿ")){ - processText.setText(processText.getText()+ resultText.getText()+"^"); - } - - isOperateValidFlag(operateValidFlag); - operator = key;//运算符为用户按的按钮 - firstDigit = true; - if (operateValidFlag == false){ - processText.setText(null); - } - operateValidFlag = true; - } - - private void isOperateValidFlag(boolean operateValidFlag) { - if(operateValidFlag){//操作合法的情况下，将小数点后的位数进行处理 - long t1 =(long) resultNum; - double t2 = resultNum - t1;//得到小数部分 - BigDecimal bd = new BigDecimal(String.valueOf(resultNum));//得到小数位数 - if (t2 == 0){ - resultText.setText(String.valueOf(t1));//转化为字符串 - } else if (bd.scale()== 1){ - resultText.setText(String.valueOf(new DecimalFormat("0.0").format(resultNum))); - } else if (bd.scale()== 2){ - resultText.setText(String.valueOf(new DecimalFormat("0.00").format(resultNum))); - } else if (bd.scale()== 3){ - resultText.setText(String.valueOf(new DecimalFormat("0.000").format(resultNum))); - } else if (bd.scale()== 4){ - resultText.setText(String.valueOf(new DecimalFormat("0.0000").format(resultNum))); - } else if (bd.scale()== 5){ - resultText.setText(String.valueOf(new DecimalFormat("0,00000").format(resultNum))); - } else if (bd.scale()== 6){ - resultText.setText(String.valueOf(new DecimalFormat("0.000000").format(resultNum))); - } else if (bd.scale()== 7){ - resultText.setText(String.valueOf(new DecimalFormat("0.0000000").format(resultNum))); - } else if (bd.scale()== 8){ - resultText.setText(String.valueOf(new DecimalFormat("0.00000000").format(resultNum))); - } else { - resultText.setText(String.valueOf(new DecimalFormat("0.000000000").format(resultNum))); - } - } - } - private double getNumberFromText() { - double result = 0; - try { - result = Double.valueOf(resultText.getText()).doubleValue(); - } catch (NumberFormatException e){ - } - return result; - } - public static void main(String[] args){ - new Calculator(); - } - } - - - - - - - - - - - - - - \ No newline at end of file