利用swing生成一个计算器
时间: 2023-12-08 13:05:20 浏览: 27
好的,以下是一个简单的计算器的 Swing 实现示例:
```java
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener {
private JTextField textField;
private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9;
private JButton buttonPlus, buttonMinus, buttonMultiply, buttonDivide, buttonEquals, buttonClear;
private JPanel panel;
private double num1 = 0, num2 = 0;
private char operator = ' ';
public Calculator() {
setTitle("Calculator");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(250, 250);
setResizable(false);
textField = new JTextField(16);
textField.setEditable(false);
button0 = new JButton("0");
button1 = new JButton("1");
button2 = new JButton("2");
button3 = new JButton("3");
button4 = new JButton("4");
button5 = new JButton("5");
button6 = new JButton("6");
button7 = new JButton("7");
button8 = new JButton("8");
button9 = new JButton("9");
buttonPlus = new JButton("+");
buttonMinus = new JButton("-");
buttonMultiply = new JButton("*");
buttonDivide = new JButton("/");
buttonEquals = new JButton("=");
buttonClear = new JButton("C");
panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(buttonPlus);
panel.add(button4);
panel.add(button5);
panel.add(button6);
panel.add(buttonMinus);
panel.add(button7);
panel.add(button8);
panel.add(button9);
panel.add(buttonMultiply);
panel.add(buttonClear);
panel.add(button0);
panel.add(buttonEquals);
panel.add(buttonDivide);
button0.addActionListener(this);
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
button5.addActionListener(this);
button6.addActionListener(this);
button7.addActionListener(this);
button8.addActionListener(this);
button9.addActionListener(this);
buttonPlus.addActionListener(this);
buttonMinus.addActionListener(this);
buttonMultiply.addActionListener(this);
buttonDivide.addActionListener(this);
buttonEquals.addActionListener(this);
buttonClear.addActionListener(this);
add(textField, BorderLayout.NORTH);
add(panel, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == button0) {
textField.setText(textField.getText() + "0");
} else if (e.getSource() == button1) {
textField.setText(textField.getText() + "1");
} else if (e.getSource() == button2) {
textField.setText(textField.getText() + "2");
} else if (e.getSource() == button3) {
textField.setText(textField.getText() + "3");
} else if (e.getSource() == button4) {
textField.setText(textField.getText() + "4");
} else if (e.getSource() == button5) {
textField.setText(textField.getText() + "5");
} else if (e.getSource() == button6) {
textField.setText(textField.getText() + "6");
} else if (e.getSource() == button7) {
textField.setText(textField.getText() + "7");
} else if (e.getSource() == button8) {
textField.setText(textField.getText() + "8");
} else if (e.getSource() == button9) {
textField.setText(textField.getText() + "9");
} else if (e.getSource() == buttonPlus) {
num1 = Double.parseDouble(textField.getText());
operator = '+';
textField.setText("");
} else if (e.getSource() == buttonMinus) {
num1 = Double.parseDouble(textField.getText());
operator = '-';
textField.setText("");
} else if (e.getSource() == buttonMultiply) {
num1 = Double.parseDouble(textField.getText());
operator = '*';
textField.setText("");
} else if (e.getSource() == buttonDivide) {
num1 = Double.parseDouble(textField.getText());
operator = '/';
textField.setText("");
} else if (e.getSource() == buttonClear) {
textField.setText("");
} else if (e.getSource() == buttonEquals) {
num2 = Double.parseDouble(textField.getText());
double result = 0;
if (operator == '+') {
result = num1 + num2;
} else if (operator == '-') {
result = num1 - num2;
} else if (operator == '*') {
result = num1 * num2;
} else if (operator == '/') {
result = num1 / num2;
}
textField.setText(result + "");
}
}
public static void main(String[] args) {
Calculator calculator = new Calculator();
calculator.setVisible(true);
}
}
```
这个计算器中包含数字按钮、加减乘除按钮、等于按钮和清除按钮。它使用 GridLayout 将按钮放置在一个 4x4 的网格中,并使用 JTextField 来显示计算结果。当用户按下数字按钮时,将数字附加到文本字段中。当用户按下运算符按钮时,将当前数字保存到 num1 中,并清空文本字段以等待下一个数字的输入。当用户按下等于按钮时,将当前数字保存到 num2 中,并根据 operator 执行相应的计算。最后,将计算结果显示在文本字段中。