该楼层疑似违规已被系统折叠 隐藏此楼查看此楼

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*; class SwingCalculator {

public static void main(String[] args) {

JFrame frame = new Calculator();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

}

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*; class Calculator extends JFrame {

private final Font BIGGER_FONT = new Font("monspaced", Font.PLAIN, 20);

private JTextField textfield;

private boolean number = true;

private String equalOp = "=";

private CalculatorOp op = new CalculatorOp(); public Calculator() {

textfield = new JTextField("0", 12);

textfield.setHorizontalAlignment(JTextField.RIGHT);

textfield.setFont(BIGGER_FONT); ActionListener numberListener = new NumberListener();

String buttonOrder = "1234567890 ";

JPanel buttonPanel = new JPanel();

buttonPanel.setLayout(new GridLayout(4, 4, 4, 4));

for (int i = 0; i < buttonOrder.length(); i++) {

String key = buttonOrder.substring(i, i+1);

if (key.equals(" ")) {

buttonPanel.add(new JLabel(""));

} else {

JButton button = new JButton(key);

button.addActionListener(numberListener);

button.setFont(BIGGER_FONT);

buttonPanel.add(button);

}

}

ActionListener operatorListener = new OperatorListener();

JPanel panel = new JPanel();

panel.setLayout(new GridLayout(4, 4, 4, 4));

String[] opOrder = {"+", "-", "*", "/","=","C"};

for (int i = 0; i < opOrder.length; i++) {

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

button.addActionListener(operatorListener);

button.setFont(BIGGER_FONT);

panel.add(button);

}

JPanel pan = new JPanel();

pan.setLayout(new BorderLayout(4, 4));

pan.add(textfield, BorderLayout.NORTH );

pan.add(buttonPanel , BorderLayout.CENTER);

pan.add(panel , BorderLayout.EAST );

this.setContentPane(pan);

this.pack();

this.setTitle("Calculator");

this.setResizable(false);

}

private void action() {

number = true;

textfield.setText("0");

equalOp = "=";

op.setTotal("0");

}

class OperatorListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

if (number) {

action();

textfield.setText("0");

} else {

number = true;

String displayText = textfield.getText();

if (equalOp.equals("=")) {

op.setTotal(displayText);

} else if (equalOp.equals("+")) {

op.add(displayText);

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