2024年1月9日发(作者：)

Java语言编写计算器程序 (swing界面)

import Layout;

import yout;

import Event;

import Listener;

import pter;

import nt;

import n;

import ;

import ;

import ield;

public class Calculator extends JFrame

{

//声明一个文本栏控件，用于显示计算结果

private JTextField txtResult;

private JPanel p;

//定义一个字符数组，将计算器中的文字都放在该数组中

private String name[] = {"7", "8", "9", "+", "4", "5", "6", "-", "1",

//声明一个按钮数组，该数组的长度以字符串数组的长度为准

private JButton button[] = new JButton[];

//定义一个存放计算结果的变量，初始为0

private double result = 0;

//存放最后一个操作符，初始为=

private String lastCommand = "=";

//标识是否开始

private boolean start = true;

public Calculator()

{

super("计算器");

//实例化文本栏控件

txtResult = new JTextField(20);

//设置文本框不是焦点状态

"2", "3", "*", "0", ".", "=", "/"};

}

usable(false);

//将文本栏控件放置在窗体框架的上方

(txtResult, );

//实例化面板对象，同时设置此面板布局为4行4列

p = new JPanel(new GridLayout(4, 4));

//循环实例化按钮

//实例化按钮监听对象

ButtonAction ba = new ButtonAction();

//实例化键盘监听对象

KeyAction ka = new KeyAction();

for(int i=0; i<; i++)

{

}

(p, );

e(200, 150);

ation(100, 100);

aultCloseOperation(_ON_CLOSE);

button[i] = new JButton(name[i]);

//注册监听

button[i].addActionListener(ba);

button[i].addKeyListener(ka);

(button[i]);

//计算

public void calculate(double x)

{

if(("+"))

{

}

else if(("-"))

{

}

else if(("*"))

{

}

else if(("/"))

{

}

else if(("="))

{

result /= x;

result *= x;

result -= x;

result += x;

}

}

result = x;

//将结果显示在文本栏

t(""+result);

//单击按钮监听

private class ButtonAction implements ActionListener

{

if(("+")||("-")||("/")||input

}

{

}

else

{

}

if(start)

{

}

t(t()+input);

t("");

start = false;

if(start)

{

}

else

{

}

calculate(ouble(t()));

lastCommand = input;

start = true;

if(("-"))

{

}

else

{

}

lastCommand = input;

t(input);

start = false;

public void actionPerformed(ActionEvent e)

{

String input = ionCommand();

.equals("*")||("="))

}

//键盘监听

private class KeyAction extends KeyAdapter

{

}

public static void main(String[] args)

{

}

Calculator f = new Calculator();

ible(true);

public void KeyTyped(KeyEvent e)

{

}

char key = Char();

if(key == '0'||key == '1'||key == '2'||key == '3'||key ==

{

}

else if(key == '+'||key == '-'||key == '*'||key == '/'||key

{

}

if(start)

{

}

else

{

}

calculate(ouble(t()));

lastCommand = f(key);

start = true;

if(key == '-')

{

}

else

lastCommand = f(key);

t(f(key));

start = false;

if(start)

{

}

t(t()+key);

t("");

start = false;

'4'||key == '5'||key == '6'||key == '7'||key == '8'||key == '9')

== '=')

}