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);
});
}
}
