图形化计算器（Swing GUI）

图形化计算器（Swing GUI）

java

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class GraphicalCalculator extends JFrame {

private JTextField display;

private double firstNumber;

private String operator;

private boolean startNewNumber;

public GraphicalCalculator() {

setTitle("Java Calculator");

setSize(300, 400);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLayout(new BorderLayout());

display = new JTextField();

display.setEditable(false);

display.setHorizontalAlignment(JTextField.RIGHT);

display.setFont(new Font("Arial", Font.BOLD, 24));

add(display, BorderLayout.NORTH);

JPanel buttonPanel = new JPanel();

buttonPanel.setLayout(new GridLayout(5, 4, 5, 5));

String[] buttons = {

"7", "8", "9", "/",

"4", "5", "6", "*",

"1", "2", "3", "-",

"0", ".", "=", "+",

"C", "CE", "√", "^"

};

for (String text : buttons) {

JButton button = new JButton(text);

button.setFont(new Font("Arial", Font.BOLD, 18));

button.addActionListener(new ButtonClickListener());

buttonPanel.add(button);

}

add(buttonPanel, BorderLayout.CENTER);

}

private class ButtonClickListener implements ActionListener {

@Override

public void actionPerformed(ActionEvent e) {

String command = e.getActionCommand();

if (command.matches("[0-9]")) {

if (startNewNumber) {

display.setText(command);

startNewNumber = false;

} else {

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

}

} else if (command.equals(".")) {

if (!display.getText().contains(".")) {

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

}

} else if (command.matches("[+\\-*/^√]")) {

firstNumber = Double.parseDouble(display.getText());

operator = command;

startNewNumber = true;

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

double secondNumber = Double.parseDouble(display.getText());

double result = 0;

switch (operator) {

case "+": result = firstNumber + secondNumber; break;

case "-": result = firstNumber - secondNumber; break;

case "*": result = firstNumber * secondNumber; break;

case "/": result = firstNumber / secondNumber; break;

case "^": result = Math.pow(firstNumber, secondNumber); break;

case "√": result = Math.sqrt(firstNumber); break; // 简化处理

}

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

startNewNumber = true;

} else if (command.equals("C")) {

display.setText("0");

firstNumber = 0;

operator = "";

startNewNumber = true;

} else if (command.equals("CE")) {

display.setText("0");

startNewNumber = true;

}

}

}

public static void main(String[] args) {

SwingUtilities.invokeLater(() -> {

GraphicalCalculator calc = new GraphicalCalculator();

calc.setVisible(true);

});

}

}