带界面的计算机:
JAVA编写。
package com.ALiangJie.Calculator;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.math.BigDecimal;
import java.util.Vector;
public class Calculator extends JFrame {
// 操作数1,为了程序的安全,初值一定设置,这里设置为0。
String string1 = "0";
// 操作数2
String string2 = "0";
//运算符
String signsl = "+";
//运算结果
String result = " ";
// 以下k1至k5为状态开关
// 开关1用于选择输入方向,将要写入str1或str2
// 为 1 时写入 str1,为 2 时写入 str2
int k1 = 1;
// 开关 2 用于记录符号键的次数
// 如果 k2>1 说明进行的是 2+3-9+8 这样的多符号运算
int k2 = 1;
// 开关3用于标识 str1 是否可以被清 0
// 等于 1 时可以,不等于1时不能被清0
int k3 = 1;
// 开关4用于标识 str2 是否可以被清 0
// 等于 1 时可以,不等于1时不能被清0
int k4 = 1;
// 开关5用于控制小数点可否被录入
// 等于1时可以,不为1时,输入的小数点被丢掉
int k5 = 1;
//用于存储被按下的键
// 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;
//vt存储之前输入的运算符
Vector vt = new Vector(20,10);
//创建一个JFrame对象并初始化,JFrame可以理解为程序的主窗口
JFrame frame=new JFrame("Calculator");
//创建一个JTextField对象并初始化,JTextField是用于显示操作和计算结果的文本框
//参数20表示可以显示20列的文本内容
JTextField result_TextField=new JTextField(result,20);
//清除按钮
JButton clear_Button = new JButton("Clear");
//数字按钮
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");
//操作符按钮
JButton button_Point=new JButton(".");
JButton button_Plus=new JButton("+");
JButton button_Minus=new JButton("-");
JButton button_Multiply=new JButton("*");
JButton button_Division=new JButton("/");
//计算按钮
JButton button_Equal=new JButton("=");
public Calculator() {
button0.setMnemonic(KeyEvent.VK_0);
result_TextField.setHorizontalAlignment(JTextField.RIGHT);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(4, 4, 5, 5));
panel.add(button7);
panel.add(button8);
panel.add(button9);
panel.add(button_Division);
panel.add(button4);
panel.add(button5);
panel.add(button6);
panel.add(button_Multiply);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button_Plus);
panel.add(button0);
panel.add(button_Point);
panel.add(button_Equal);
panel.add(button_Minus);
panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JPanel panel2 = new JPanel();
panel2.setLayout(new BorderLayout());
panel2.add(result_TextField, BorderLayout.WEST);
panel2.add(clear_Button, BorderLayout.EAST);
frame.setLocation(300, 200);
frame.setResizable(true);
frame.getContentPane().setLayout(new BorderLayout());
frame.getContentPane().add(panel2, BorderLayout.NORTH);
frame.getContentPane().add(panel, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
class Listener_Clear implements ActionListener {
public void actionPerformed(ActionEvent e) {
store = (JButton) e.getSource();
vt.add(store);
k5 = 1;
k2 = 1;
k1 = 1;
k3 = 1;
k4 = 1;
string1 = "0";
string2 = "0";
signsl = "";
result = "";
result_TextField.setText(result);
vt.clear();
}
}
//数字键
class Listener_Number implements ActionListener {
public void actionPerformed(ActionEvent e) {
// 获取事件源,并从事件源中获取输入的数据
String ss = ((JButton) e.getSource()).getText();
store = (JButton) e.getSource();
vt.add(store);
if (k1 == 1) {
if (k3 == 1) {
string1 = "";
// 还原开关k5状态
k5 = 1;
}
string1 = string1 + ss;
k3 = k3 + 1;
// 显示结果
result_TextField.setText(string1);
} else if (k1 == 2) {
if (k4 == 1) {
string2 = "";
// 还原开关k5状态
k5 = 1;
}
string2 = string2 + ss;
k4 = k4 + 1;
result_TextField.setText(string2);
}
}
}
class Listener_Point 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) {
string1 = "";
// 还原开关k5状态
k5 = 1;
}
string1 = string1 + ss2;
k3 = k3 + 1;
// 显示结果
result_TextField.setText(string1);
} else if (k1 == 2) {
if (k4 == 1) {
string2 = "";
// 还原开关k5的状态
k5 = 1;
}
string2 = string2 + ss2;
k4 = k4 + 1;
result_TextField.setText(string2);
}
}
k5 = k5 + 1;
}
}
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 写输入值,为 2 时向数2写输入值。
k1 = 2;
k5 = 1;
signsl = 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();
string1 = result;
// 开关 k1 为 1 时,向数 1 写值,为2时向数2写
k1 = 2;
k5 = 1;
k4 = 1;
signsl = ss2;
}
k2 = k2 + 1;
}
}
}
class Listener_Equal implements ActionListener {
public void actionPerformed(ActionEvent e) {
store = (JButton) e.getSource();
vt.add(store);
cal();
// 还原开关k1状态
k1 = 1;
// 还原开关k2状态
k2 = 1;
// 还原开关k3状态
k3 = 1;
// 还原开关k4状态
k4 = 1;
// 为 7+5=12 +5=17 这种计算做准备
string1 = result;
}
}
// 监听等于键
Listener_Equal listener_equal = new Listener_Equal();
Listener_Signal listener_signal = new Listener_Signal();
Listener_Clear listener_clear = new Listener_Clear();
Listener_Point listener_point = new Listener_Point();
Listener_Number listener_number = new Listener_Number();
button7.addActionListener(listener_number);
button8.addActionListener(listener_number);
button9.addActionListener(listener_number);
button_Division.addActionListener(listener_signal);
button4.addActionListener(listener_number);
button5.addActionListener(listener_number);
button6.addActionListener(listener_number);
button_Multiply.addActionListener(listener_signal);
button1.addActionListener(listener_number);
button2.addActionListener(listener_number);
button3.addActionListener(listener_number);
button_Minus.addActionListener(listener_signal);
button0.addActionListener(listener_number);
button_Point.addActionListener(listener_point);
button_Equal.addActionListener(listener_equal);
button_Plus.addActionListener(listener_signal);
clear_Button.addActionListener(listener_clear);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
// 计算逻辑
public void cal() {
// 操作数1
double a2;
// 操作数2
double b2;
// 运算符
String c = signsl;
// 运算结果
double result2 = 0;
if (c.equals("")) {
result_TextField.setText("Please input operator");
} else {
// 手动处理小数点的问题
if (string1.equals("."))
string1 = "0.0";
if (string2.equals("."))
string2 = "0.0";
a2 = Double.valueOf(string1).doubleValue();
b2 = Double.valueOf(string2).doubleValue();
if (c.equals("+")) {
result2 = a2 + b2;
}
if (c.equals("-")) {
result2 = a2 - b2;
}
if (c.equals("*")) {
BigDecimal m1 = new BigDecimal(Double.toString(a2));
BigDecimal m2 = new BigDecimal(Double.toString(b2));
result2 = m1.multiply(m2).doubleValue();
}
if (c.equals("/")) {
if (b2 == 0) {
result2 = 0;
} else {
result2 = a2 / b2;
}
}
result = ((new Double(result2)).toString());
result_TextField.setText(result);
}
}
public static void main(String[] args){
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
}catch (Exception e){
e.printStackTrace();
}
Calculator calculator = new Calculator();
}
}
先挂着有时间来写过程。
代码文件附上链接:GitHub