java gui编程 计算器_Matlab-GUI编程：简单计算器的实现

对于Java GUI编程实现计算器，你可以使用Swing和AWT这两种Java GUI工具包之一。

以下是一个简单的Java GUI计算器的实现示例：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Calculator extends JFrame implements ActionListener {

    private JButton[] numberButtons;
    private JButton[] operatorButtons;
    private JButton clearButton, equalsButton, decimalButton;
    private JTextField textField;

    private double num1 = 0, num2 = 0, result = 0;
    private char operator;

    public Calculator() {
        setTitle("Calculator");

        // Create the number buttons
        numberButtons = new JButton[10];
        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton(String.valueOf(i));
        }

        // Create the operator buttons
        operatorButtons = new JButton[4];
        operatorButtons[0] = new JButton("+");
        operatorButtons[1] = new JButton("-");
        operatorButtons[2] = new JButton("*");
        operatorButtons[3] = new JButton("/");

        // Create the clear, equals, and decimal buttons
        clearButton = new JButton("C");
        equalsButton = new JButton("=");
        decimalButton = new JButton(".");

        // Create the text field
        textField = new JTextField(10);
        textField.setEditable(false);

        // Set the layout manager and add the components
        setLayout(new GridBagLayout());
        GridBagConstraints gc = new GridBagConstraints();
        gc.gridx = 0;
        gc.gridy = 0;
        gc.gridwidth = 4;
        add(textField, gc);
        gc.gridwidth = 1;
        gc.gridy = 1;

        for (int i = 0; i < 10; i++) {
            gc.gridx = i % 3;
            gc.gridy = i / 3 + 2;
            add(numberButtons[i], gc);
            numberButtons[i].addActionListener(this);
        }

        gc.gridx = 0;
        gc.gridy = 5;
        add(operatorButtons[0], gc);
        operatorButtons[0].addActionListener(this);

        gc.gridx = 1;
        add(operatorButtons[1], gc);
        operatorButtons[1].addActionListener(this);

        gc.gridx = 2;
        add(operatorButtons[2], gc);
        operatorButtons[2].addActionListener(this);

        gc.gridx = 3;
        add(operatorButtons[3], gc);
        operatorButtons[3].addActionListener(this);

        gc.gridx = 0;
        gc.gridy = 6;
        add(clearButton, gc);
        clearButton.addActionListener(this);

        gc.gridx = 1;
        add(equalsButton, gc);
        equalsButton.addActionListener(this);

        gc.gridx = 2;
        add(decimalButton, gc);
        decimalButton.addActionListener(this);

        setSize(200, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        for (int i = 0; i < 10; i++) {
            if (e.getSource() == numberButtons[i]) {
                textField.setText(textField.getText() + i);
            }
        }

        if (e.getSource() == decimalButton) {
            textField.setText(textField.getText() + ".");
        }

        if (e.getSource() == clearButton) {
            textField.setText("");
            num1 = 0;
            num2 = 0;
            result = 0;
            operator = ' ';
        }

        if (e.getSource() == operatorButtons[0]) {
            num1 = Double.parseDouble(textField.getText());
            operator = '+';
            textField.setText("");
        }

        if (e.getSource() == operatorButtons[1]) {
            num1 = Double.parseDouble(textField.getText());
            operator = '-';
            textField.setText("");
        }

        if (e.getSource() == operatorButtons[2]) {
            num1 = Double.parseDouble(textField.getText());
            operator = '*';
            textField.setText("");
        }

        if (e.getSource() == operatorButtons[3]) {
            num1 = Double.parseDouble(textField.getText());
            operator = '/';
            textField.setText("");
        }

        if (e.getSource() == equalsButton) {
            num2 = Double.parseDouble(textField.getText());

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

            textField.setText(Double.toString(result));
        }
    }

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

这个示例应该可以实现一个简单的Java GUI计算器。