用javaGUI知识编写一个计算机并实现功能

好的，我可以帮您编写一个简单的计算器，实现加减乘除四则运算的功能。以下是代码实现：

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Calculator extends JFrame {

    private JPanel contentPane;
    private JTextField textField;

    double firstnum, secondnum, result;
    String operations, answer;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Calculator frame = new Calculator();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Calculator() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 332, 416);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        textField = new JTextField();
        textField.setBounds(10, 11, 296, 46);
        contentPane.add(textField);
        textField.setColumns(10);

        // Number buttons
        JButton btn1 = new JButton("1");
        btn1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn1.getText();
                textField.setText(Enternumber);
            }
        });
        btn1.setBounds(10, 77, 60, 50);
        contentPane.add(btn1);

        JButton btn2 = new JButton("2");
        btn2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn2.getText();
                textField.setText(Enternumber);
            }
        });
        btn2.setBounds(80, 77, 60, 50);
        contentPane.add(btn2);

        JButton btn3 = new JButton("3");
        btn3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn3.getText();
                textField.setText(Enternumber);
            }
        });
        btn3.setBounds(150, 77, 60, 50);
        contentPane.add(btn3);

        JButton btn4 = new JButton("4");
        btn4.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn4.getText();
                textField.setText(Enternumber);
            }
        });
        btn4.setBounds(10, 138, 60, 50);
        contentPane.add(btn4);

        JButton btn5 = new JButton("5");
        btn5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn5.getText();
                textField.setText(Enternumber);
            }
        });
        btn5.setBounds(80, 138, 60, 50);
        contentPane.add(btn5);

        JButton btn6 = new JButton("6");
        btn6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn6.getText();
                textField.setText(Enternumber);
            }
        });
        btn6.setBounds(150, 138, 60, 50);
        contentPane.add(btn6);

        JButton btn7 = new JButton("7");
        btn7.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn7.getText();
                textField.setText(Enternumber);
            }
        });
        btn7.setBounds(10, 199, 60, 50);
        contentPane.add(btn7);

        JButton btn8 = new JButton("8");
        btn8.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn8.getText();
                textField.setText(Enternumber);
            }
        });
        btn8.setBounds(80, 199, 60, 50);
        contentPane.add(btn8);

        JButton btn9 = new JButton("9");
        btn9.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn9.getText();
                textField.setText(Enternumber);
            }
        });
        btn9.setBounds(150, 199, 60, 50);
        contentPane.add(btn9);

        JButton btn0 = new JButton("0");
        btn0.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String Enternumber = textField.getText() + btn0.getText();
                textField.setText(Enternumber);
            }
        });
        btn0.setBounds(80, 260, 60, 50);
        contentPane.add(btn0);

        // Operator buttons
        JButton btnPlus = new JButton("+");
        btnPlus.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                firstnum = Double.parseDouble(textField.getText());
                textField.setText("");
                operations = "+";
            }
        });
        btnPlus.setBounds(221, 77, 85, 50);
        contentPane.add(btnPlus);

        JButton btnMinus = new JButton("-");
        btnMinus.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                firstnum = Double.parseDouble(textField.getText());
                textField.setText("");
                operations = "-";
            }
        });
        btnMinus.setBounds(221, 138, 85, 50);
        contentPane.add(btnMinus);

        JButton btnMultiply = new JButton("*");
        btnMultiply.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                firstnum = Double.parseDouble(textField.getText());
                textField.setText("");
                operations = "*";
            }
        });
        btnMultiply.setBounds(221, 199, 85, 50);
        contentPane.add(btnMultiply);

        JButton btnDivide = new JButton("/");
        btnDivide.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                firstnum = Double.parseDouble(textField.getText());
                textField.setText("");
                operations = "/";
            }
        });
        btnDivide.setBounds(221, 260, 85, 50);
        contentPane.add(btnDivide);

        JButton btnClear = new JButton("C");
        btnClear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                textField.setText(null);
            }
        });
        btnClear.setBounds(150, 260, 60, 50);
        contentPane.add(btnClear);

        JButton btnEqual = new JButton("=");
        btnEqual.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String answer;
                secondnum = Double.parseDouble(textField.getText());

                if (operations == "+") {
                    result = firstnum + secondnum;
                    answer = String.format("%.2f", result);
                    textField.setText(answer);
                } else if (operations == "-") {
                    result = firstnum - secondnum;
                    answer = String.format("%.2f", result);
                    textField.setText(answer);
                } else if (operations == "*") {
                    result = firstnum * secondnum;
                    answer = String.format("%.2f", result);
                    textField.setText(answer);
                } else if (operations == "/") {
                    result = firstnum / secondnum;
                    answer = String.format("%.2f", result);
                    textField.setText(answer);
                }
            }
        });
        btnEqual.setBounds(10, 260, 60, 50);
        contentPane.add(btnEqual);
    }
}

运行后，您就可以使用这个计算器进行四则运算了。