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import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class MyCalculator extends JFrame implements ActionListener {

private String[] texts = {"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+","√"};

private JTextField display = new JTextField("0");

private JButton reset = new JButton("CE");

private JButton[] buttons = new JButton[texts.length];

public MyCalculator() {

super("计算器");

JPanel jpanel1 = new JPanel(new GridLayout(5,4));

for(int i = 0;i

buttons[i] = new JButton(texts[i]);

buttons[i].addActionListener(this);

jpanel1.add(buttons[i]);

}

reset.addActionListener(this);

JPanel jpanel2 = new JPanel(new BorderLayout());

jpanel2.add("Center",display);

jpanel2.add("East",reset);

this.getContentPane().setLayout(new BorderLayout());

this.getContentPane().add("North",jpanel2);

this.getContentPane().add("Center", jpanel1);

setSize(300,300);

setVisible(true);

}

//用户输入数字的处理

boolean isFirstDigit = true;

public void handleNumber(String key) {

if(isFirstDigit){

display.setText(key);

}else if(key.equals(".") && display.getText().indexOf(".") < 0) {

display.setText(display.getText() + ".");

}else if ( !key.equals(".")) {

display.setText(display.getText() + key);

}

isFirstDigit = false;

}

double number = 0.0;

String operator = "=";

//清空文本框

public void hanhleReset() {

display.setText("0");

operator = "=";

isFirstDigit = true;

}

//运算的处理

public void handleOperator(String key) {

if (operator.equals("+")) {

number += Double.valueOf(display.getText());

} else if(operator.equals("-")) {

number -= Double.valueOf(display.getText());

} else if(operator.equals("*")){

number *= Double.valueOf(display.getText());

} else if(operator.equals("√")){

number *= Double.valueOf(display.getText());

} else if(operator.equals("/")) {

number /= Double.valueOf(display.getText());

} else if(operator.equals("=")) {

number = Double.valueOf(display.getText());

}

display.setText(String.valueOf(number));

operator = key;

isFirstDigit = true;

}

@Override

public void actionPerformed(ActionEvent e) {

Object target = e.getSource();

String label = e.getActionCommand();

if("0123456789.".indexOf(label) > 0) {

handleNumber (label);

} else if(target == reset) {

hanhleReset();

} else {

handleOperator(label);

}

}

public static void main (String[] args){

new MyCalculator();

}

}