整数版计算器

package aa;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Calculator1 extends JFrame implements ActionListener {

private JTextField m_textField = new JTextField(12);

private JButton[] m_button = { new JButton("1"), new JButton("2"),

new JButton("3"), new JButton("4"), new JButton("5"),

new JButton("6"), new JButton("7"), new JButton("8"),

new JButton("9"), new JButton("0"), new JButton("+"),

new JButton("-"), new JButton("*"), new JButton("/"),

new JButton("."), new JButton("="), new JButton("C") };

public Calculator1() {

super("Calculator");

Container container = getContentPane();

container.setLayout(new FlowLayout(FlowLayout.CENTER));

container.add(m_textField);

for (int i = 0; i <= 16; i++) {

container.add(m_button[i]);

m_button[i].addActionListener(this);

}

setSize(200, 200);

setVisible(true);

}

int flag;

double value1, value2, result;//

public void actionPerformed(ActionEvent e) {

int i;

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

if (e.getSource() == m_button[i]) {

String value = String.valueOf((i + 1) % 10);

m_textField.setText(m_textField.getText() + value);

}

}

if (e.getSource() == m_button[10]) //

{

flag = 1;

value1 = Double.parseDouble(m_textField.getText());//

m_textField.setText(""); //

} else if (e.getSource() == m_button[11]) //

{

flag = 2;

value1 = Double.parseDouble(m_textField.getText());

m_textField.setText("");

} else if (e.getSource() == m_button[12])//

{

flag = 3;

value1 = Double.parseDouble(m_textField.getText());

m_textField.setText("");

} else if (e.getSource() == m_button[13]) //

{

flag = 4;

value1 = Double.parseDouble(m_textField.getText());

m_textField.setText("");

} else if (e.getSource() == m_button[15]) // =

{

value2 = Double.parseDouble(m_textField.getText()); //

if (flag == 1)

result = value1 + value2;

else if (flag == 2)

result = value1 - value2;

else if (flag == 3)

result = value1 * value2;

else if (flag == 4) {

if (value2 != 0)

result = value1 / value2;

else

result = 0;

}

String r = String.valueOf(result);

m_textField.setText(r);

} else if (e.getSource() == m_button[14]) // .

{

boolean b = true;// whether exists '.'

String r = m_textField.getText();//

for (int j = 0; j < r.length(); j++) {

if (r.charAt(j) == ".".charAt(0)){

b = false;

}

}

if (b){

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

}

} else if (e.getSource() == m_button[16]) //

m_textField.setText("");

}

public static void main(String args[]) {

Calculator1 app = new Calculator1();

app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}