简单计算器Calculatorv1.0

/** * */ package codevald.calculator; /** * @Description * @author codevald * @Version v1.0 */ import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.Vector; import java.math.BigDecimal; public class Calculator { //操作数1，为了程序的安全，初值一定要设置。这里设置为0 //操作数1 String str1 = "0"; //操作数2 String str2 = "0"; //运算符 String signal = "+"; //运算结果 String result = ""; //以下k1至k2为状态开关 //开关k1用于选择输入的方向，将要写入str1或str2,1表示输入str1,2表示输入str2 int k1 = 1; //开关k2用于记录符号键的次数,如果k2 > 1 表示进行的是向2 + 3 -9 + 8 这样的多符号的运算 k2 = 1表示是普通运算 int k2 = 1; //k3表示str1是否可以被清0，1表示可以，不为1表示不可以 int k3 = 1; //k4表示str1是否可以被清0，1表示可以，不为1表示不可以 int k4 = 1; //k5表示str2是否可以被清0，1表示可以，不为1表示不可以 int k5 = 1; //store的作用类似于寄存器，用于记录是否连续按下符号键 JButton store; Vector vt = new Vector(20,10); //声明各个UI组件对象并初始化 JFrame frame = new JFrame("Calculator"); JTextField result_TextField = new JTextField(result,20); //20表示文本框占20列 JButton clear_Button = new JButton("clear"); JButton button0 = new JButton("0"); JButton button1 = new JButton("1"); JButton button2 = new JButton("2"); JButton button3 = new JButton("3"); JButton button4 = new JButton("4"); JButton button5 = new JButton("5"); JButton button6 = new JButton("6"); JButton button7 = new JButton("7"); JButton button8 = new JButton("8"); JButton button9 = new JButton("9"); JButton button_Dian = new JButton("."); JButton button_jia = new JButton("+"); JButton button_jian = new JButton("-"); JButton button_cheng = new JButton("*"); JButton button_chu = new JButton("/"); JButton button_dy = new JButton("="); //构造器 public Calculator() { //为按钮0设置等效键，即可以通过对应的键盘按键来代替点击它 button0.setMnemonic(KeyEvent.VK_0); button1.setMnemonic(KeyEvent.VK_1); button2.setMnemonic(KeyEvent.VK_2); button3.setMnemonic(KeyEvent.VK_3); button4.setMnemonic(KeyEvent.VK_4); button5.setMnemonic(KeyEvent.VK_5); button6.setMnemonic(KeyEvent.VK_6); button7.setMnemonic(KeyEvent.VK_7); button8.setMnemonic(KeyEvent.VK_8); button9.setMnemonic(KeyEvent.VK_9); clear_Button.setMnemonic(KeyEvent.VK_CLEAR); button_jia.setMnemonic(KeyEvent.VK_ADD); button_jian.setMnemonic(KeyEvent.VK_SUBTRACT); button_cheng.setMnemonic(KeyEvent.VK_MULTIPLY); button_chu.setMnemonic(KeyEvent.VK_DIVIDE); button_dy.setMnemonic(KeyEvent.VK_EQUALS); //设置文本框右对齐，是输入与结果都靠右显示 result_TextField.setHorizontalAlignment(JTextField.RIGHT); //将UI组件添加进容器内 JPanel pan = new JPanel(); pan.setLayout(new GridLayout(4,4,5,5)); pan.add(button7); pan.add(button8); pan.add(button9); pan.add(button_chu); pan.add(button4); pan.add(button5); pan.add(button6); pan.add(button_cheng); pan.add(button1); pan.add(button2); pan.add(button3); pan.add(button_jian); pan.add(button0); pan.add(button_Dian); pan.add(button_dy); pan.add(button_jia); pan.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); JPanel pan2 = new JPanel(); pan2.setLayout(new BorderLayout()); pan2.add(result_TextField,BorderLayout.WEST); pan2.add(clear_Button,BorderLayout.EAST); //设置主窗口出现在屏幕上的位置 frame.setLocation(100,200); //设置窗体不能调整大小 frame.setResizable(false); frame.getContentPane().setLayout(new BorderLayout()); frame.getContentPane().add(pan2,BorderLayout.NORTH); frame.getContentPane().add(pan,BorderLayout.CENTER); frame.pack(); frame.setVisible(true); //事件处理程序 //数字键 class Listener implements ActionListener { public void actionPerformed(ActionEvent e) { String ss = ((JButton) e.getSource()).getText(); store = (JButton) e.getSource(); vt.add(store); if (k1 == 1) { if (k3 == 1) { str1 = ""; k5 = 1; } str1 = str1 + ss; k3 = k3 + 1; //显示结果 result_TextField.setText(str1); } else if (k1 == 2) { if (k4 == 1) { str2 = ""; k5 = 1; } str2 = str2 + ss; k4 = k4 + 1; result_TextField.setText(str2); } } } //输入的运算符号的处理 class Listener_signal implements ActionListener { public void actionPerformed(ActionEvent e) { String ss2 = ((JButton) e.getSource()).getText(); store = (JButton) e.getSource(); vt.add(store); if (k2 == 1) { //开关k1为1时向数1写入输入值，为2时向数2写入输入值 k1 = 2; k5 = 1; signal = ss2; k2 = k2 + 1; //按符号键的次数 } else { int a = vt.size(); JButton c = (JButton) vt.get(a - 2); if (!(c.getText().equals("+")) && !(c.getText().equals("-")) && !(c.getText().equals("*")) && !(c.getText().equals("/"))) { cal(); str1 = result; //开关k1为1时，向数1写入数值，为2时向数2写入数值 k1 = 2; k5 = 1; k4 = 1; signal = ss2; } k2 = k2 + 1; } } } //清除键的逻辑（Clear） class Listener_clear implements ActionListener { public void actionPerformed(ActionEvent e) { store = (JButton) e.getSource(); vt.add(store); k1 = 1; k2 = 1; k3 = 1; k4 = 1; k5 = 1; str1 = "0"; str2 = "0"; signal = ""; result = ""; result_TextField.setText(result); vt.clear(); } } //等于键的逻辑 class Listener_dy implements ActionListener { public void actionPerformed(ActionEvent e) { store = (JButton) e.getSource(); vt.add(store); cal(); //还原各个开关的状态 k1 = 1; k2 = 1; k3 = 1; k4 = 1; str1 = result; } } //小数点的处理 class Listener_xiaos implements ActionListener { public void actionPerformed(ActionEvent e) { store = (JButton) e.getSource(); vt.add(store); if (k5 == 1) { String ss2 = ((JButton) e.getSource()).getText(); if (k1 == 1) { if (k3 == 1) { str1 = ""; //还原开关k5的状态 k5 = 1; } str1 = str1 + ss2; k3 = k3 + 1; //显示结果 result_TextField.setText(str1); } else if (k1 == 2) { if (k4 == 1) { str2 = ""; //还原开关k5的状态 k5 = 1; } str2 = str2 + ss2; k4 = k4 + 1; result_TextField.setText(str2); } } k5 = k5 + 1; } } //注册各个监听器，即绑定事件响应逻辑�