.编写JFrame程序实现一个计算器，包括十个数字（0-9）按钮和四个运算符（加、减、乘、除）按钮，以及等号和清空两个辅助按钮，还有一个显示输入输出的文本框。程序中使用BorderLayout和GridLayout

以下是 Java 实现一个简单计算器的示例代码：

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Calculator extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;

    private JTextField textField;
    private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9;
    private JButton buttonAdd, buttonSub, buttonMul, buttonDiv, buttonEqu, buttonC;

    private double num1 = 0, num2 = 0;
    private String operator = "";

    public Calculator() {
        super("Calculator");

        textField = new JTextField(20);
        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");

        buttonAdd = new JButton("+");
        buttonSub = new JButton("-");
        buttonMul = new JButton("*");
        buttonDiv = new JButton("/");
        buttonEqu = new JButton("=");
        buttonC = new JButton("C");

        JPanel panel1 = new JPanel();
        panel1.setLayout(new GridLayout(4, 3));
        panel1.add(button1);
        panel1.add(button2);
        panel1.add(button3);
        panel1.add(button4);
        panel1.add(button5);
        panel1.add(button6);
        panel1.add(button7);
        panel1.add(button8);
        panel1.add(button9);
        panel1.add(button0);
        panel1.add(buttonC);
        panel1.add(buttonEqu);

        JPanel panel2 = new JPanel();
        panel2.setLayout(new GridLayout(4, 1));
        panel2.add(buttonAdd);
        panel2.add(buttonSub);
        panel2.add(buttonMul);
        panel2.add(buttonDiv);

        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.add(textField, BorderLayout.NORTH);
        panel.add(panel1, BorderLayout.CENTER);
        panel.add(panel2, BorderLayout.EAST);

        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);

        buttonAdd.addActionListener(this);
        buttonSub.addActionListener(this);
        buttonMul.addActionListener(this);
        buttonDiv.addActionListener(this);
        buttonEqu.addActionListener(this);
        buttonC.addActionListener(this);

        this.add(panel);
        this.pack();
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }

    public static void main(String[] args) {
        new Calculator();
    }

    public void actionPerformed(ActionEvent e) {
        String str = e.getActionCommand();
        if ("0123456789".indexOf(str) != -1) {
            textField.setText(textField.getText() + str);
            return;
        }
        if ("+-*/".indexOf(str) != -1) {
            num1 = Double.parseDouble(textField.getText());
            operator = str;
            textField.setText("");
            return;
        }
        if ("=".equals(str)) {
            num2 = Double.parseDouble(textField.getText());
            double result = 0;
            switch (operator) {
                case "+":
                    result = num1 + num2;
                    break;
                case "-":
                    result = num1 - num2;
                    break;
                case "*":
                    result = num1 * num2;
                    break;
                case "/":
                    if (num2 == 0) {
                        textField.setText("除数不能为0！");
                        return;
                    } else {
                        result = num1 / num2;
                    }
                    break;
                default:
                    break;
            }
            textField.setText(Double.toString(result));
            operator = "";
            return;
        }
        if ("C".equals(str)) {
            textField.setText("");
            num1 = 0;
            num2 = 0;
            operator = "";
            return;
        }
    }
}

这个程序使用了 BorderLayout 和 GridLayout 布局管理器来布置计算器的按钮，并实现了按钮的事件处理逻辑。用户点击数字按钮时，将数字添加到文本框中；用户点击运算符按钮时，将第一个数值和运算符保存下来，并清空文本框；用户点击等号按钮时，将第二个数值取出来，根据运算符计算结果，并显示在文本框中；用户点击清空按钮时，将所有状态清空。