求一个简单的Java 小程序源文件！高分悬赏！

import javaxswing;

import javaawt;

import javaawtevent;

public class Calculator extends JFrame implements ActionListener

{

private boolean dotExist, operated, equaled; // 帮助运算的布尔变量

private double storedNumber; // 目前的结果

private char lastOperator; // 表示上一运算符

private JTextField operation; // 结果栏

private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; // 运算符

private JButton[] numbers; // 数字

// 构造者

public Calculator()

{

setTitle("Calculator");

// 初始化变量

dotExist = false; // 表示当前的数是否有小数点

operated = false; // 表示任意运算符是否被按下

equaled = false; // 表示等号是否被按下

storedNumber = 0;

lastOperator = '';

// 初始化窗口变量

operation = new JTextField("0");

operationsetEditable(false);

numbers = new JButton[10];

for (int i = 0; i < 10; i++)

numbers[i] = new JButton("" + i);

dot = new JButton("");

plus = new JButton("+");

minus = new JButton("-");

multi = new JButton("");

div = new JButton("/");

sqrt = new JButton("√");

equal = new JButton("=");

changePN = new JButton("±");

clear = new JButton("AC");

// 将窗口物体放入窗口

GridBagLayout layout = new GridBagLayout();

getContentPane()setLayout(layout);

addComponent(layout, operation, 0, 0, 4, 1);

addComponent(layout, numbers[1], 1, 0, 1, 1);

addComponent(layout, numbers[2], 1, 1, 1, 1);

addComponent(layout, numbers[3], 1, 2, 1, 1);

addComponent(layout, numbers[4], 2, 0, 1, 1);

addComponent(layout, numbers[5], 2, 1, 1, 1);

addComponent(layout, numbers[6], 2, 2, 1, 1);

addComponent(layout, numbers[7], 3, 0, 1, 1);

addComponent(layout, numbers[8], 3, 1, 1, 1);

addComponent(layout, numbers[9], 3, 2, 1, 1);

addComponent(layout, dot, 4, 0, 1, 1);

addComponent(layout, numbers[0], 4, 1, 1, 1);

addComponent(layout, sqrt, 4, 2, 1, 1);

addComponent(layout, plus, 1, 3, 1, 1);

addComponent(layout, minus, 2, 3, 1, 1);

addComponent(layout, multi, 3, 3, 1, 1);

addComponent(layout, div, 4, 3, 1, 1);

addComponent(layout, equal, 5, 0, 2, 1);

addComponent(layout, changePN, 5, 2, 1, 1);

addComponent(layout, clear, 5, 3, 1, 1);

}

// 对按钮进行反应的方法

public void actionPerformed(ActionEvent e)

{

JButton btn = (JButton)egetSource();

if (btn == clear)

{

operationsetText("0");

dotExist = false;

storedNumber = 0;

lastOperator = '';

}

else if (btn == equal)

{

operate('=');

equaled = true;

}

else if (btn == plus)

{

operate('+');

equaled = false;

}

else if (btn == minus)

{

operate('-');

equaled = false;

}

else if (btn == multi)

{

operate('');

equaled = false;

}

else if (btn == div)

{

operate('/');

equaled = false;

}

else if (btn == changePN)

{

operate('p');

operate('=');

equaled = true;

}

else if (btn == sqrt)

{

operate('s');

operate('=');

equaled = true;

}

else

{

if (equaled)

storedNumber = 0;

for (int i = 0; i < 10; i++)

if (btn == numbers[i])

{

if (operationgetText()equals("0"))

operationsetText("" + i);

else if(! operated)

operationsetText(operationgetText() + i);

else

{

operationsetText("" + i);

operated = false;

}

}

if (btn == dot && ! dotExist)

{

operationsetText(operationgetText() + "");

dotExist = true;

}

}

}

// 进行运算的方法

private void operate(char operator)

{

double currentNumber = DoublevalueOf(operationgetText())doubleValue();

if (lastOperator == '')

storedNumber = currentNumber;

else if (lastOperator == '+')

storedNumber += currentNumber;

else if (lastOperator == '-')

storedNumber -= currentNumber;

else if (lastOperator == '')

storedNumber = currentNumber;

else if (lastOperator == '/')

storedNumber /= currentNumber;

else if (lastOperator == 'p')

storedNumber = -1;

else if (lastOperator == 's')

storedNumber = Mathsqrt(currentNumber);

else if (lastOperator == '=' && equaled)

storedNumber = currentNumber;

operationsetText("" + storedNumber);

operated = true;

lastOperator = operator;

}

// 快捷使用GridBagLayout的方法

private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height)

{

GridBagConstraints constraints = new GridBagConstraints();

constraintsfill = GridBagConstraintsBOTH;

constraintsinsets = new Insets(10, 2, 10, 2);

constraintsweightx = 100;

constraintsweighty = 100;

constraintsgridx = col;

constraintsgridy = row;

constraintsgridwidth = width;

constraintsgridheight = height;

layoutsetConstraints(component, constraints);

if (component instanceof JButton)

((JButton)component)addActionListener(this);

getContentPane()add(component);

}

// 主方法初始化并显示窗口

public static void main(String[] args)

{

Calculator calc = new Calculator();

calcsetSize(290, 400);

calcsetVisible(true);

}

}

如果你想加sin cos tan的话就建它们的按钮 在actionPerformed方法中的if-else语句中加else if (btn == sin){operate('S');operate('=');equaled = true;}然后在operate方法加对应的语句就行了记忆M+, M-没时间搞 这个应该比较简单容易明白吧

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