java中awt写一个混合计算的计算器

以下是一个简单的混合计算的计算器的示例代码：

import java.awt.*;
import java.awt.event.*;

public class Calculator extends Frame implements ActionListener {

    TextField tf;
    Button b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, bAdd, bSub, bMul, bDiv, bEq, bClr;

    double num1, num2, result;
    char op;

    public Calculator() {
        tf = new TextField();
        b1 = new Button("1");
        b2 = new Button("2");
        b3 = new Button("3");
        b4 = new Button("4");
        b5 = new Button("5");
        b6 = new Button("6");
        b7 = new Button("7");
        b8 = new Button("8");
        b9 = new Button("9");
        b0 = new Button("0");
        bAdd = new Button("+");
        bSub = new Button("-");
        bMul = new Button("*");
        bDiv = new Button("/");
        bEq = new Button("=");
        bClr = new Button("C");

        setLayout(new FlowLayout());

        add(tf);

        add(b1);
        add(b2);
        add(b3);
        add(bAdd);

        add(b4);
        add(b5);
        add(b6);
        add(bSub);

        add(b7);
        add(b8);
        add(b9);
        add(bMul);

        add(b0);
        add(bClr);
        add(bEq);
        add(bDiv);

        b1.addActionListener(this);
        b2.addActionListener(this);
        b3.addActionListener(this);
        b4.addActionListener(this);
        b5.addActionListener(this);
        b6.addActionListener(this);
        b7.addActionListener(this);
        b8.addActionListener(this);
        b9.addActionListener(this);
        b0.addActionListener(this);
        bAdd.addActionListener(this);
        bSub.addActionListener(this);
        bMul.addActionListener(this);
        bDiv.addActionListener(this);
        bEq.addActionListener(this);
        bClr.addActionListener(this);

        setSize(200, 200);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent ae) {
        String s = ae.getActionCommand();

        if (s.equals("C")) {
            tf.setText("");
            num1 = 0;
            num2 = 0;
            result = 0;
        }
        else if (s.equals("+")) {
            num1 = Double.parseDouble(tf.getText());
            op = '+';
            tf.setText("");
        }
        else if (s.equals("-")) {
            num1 = Double.parseDouble(tf.getText());
            op = '-';
            tf.setText("");
        }
        else if (s.equals("*")) {
            num1 = Double.parseDouble(tf.getText());
            op = '*';
            tf.setText("");
        }
        else if (s.equals("/")) {
            num1 = Double.parseDouble(tf.getText());
            op = '/';
            tf.setText("");
        }
        else if (s.equals("=")) {
            num2 = Double.parseDouble(tf.getText());

            switch (op) {
                case '+':
                    result = num1 + num2;
                    break;
                case '-':
                    result = num1 - num2;
                    break;
                case '*':
                    result = num1 * num2;
                    break;
                case '/':
                    result = num1 / num2;
                    break;
            }

            tf.setText("" + result);
        }
        else {
            String temp = tf.getText();
            temp += s;
            tf.setText(temp);
        }
    }

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

运行该程序，可以看到一个简单的混合计算的计算器界面，支持加、减、乘、除四种运算以及清除、等于、小数点等操作。