用Java语言创建一个简单的计算器 计算器布局有:顶部有一个显示标签，用于显示计算结果，一个文本框，让用户在中间输入一个整数/双精度浮点数，几个按钮为“CLR”, “ +” , “ -” , “ *” ,“ /”在 底 部。 功能:创建一个累加器状态变量，跟踪当前计算的总体值。点击“CLR”按钮，将累加器值设置为0点击“+”按钮 ，将文本字段值添加到累加器值中点击“-”按钮，从累加器值中减去本字段值，点击“*”按钮，累加器值乘以文本字段值，点击“/”按钮，累加器值除以文本域值。按下按钮后，用新的累加器更新显示标签，清空文本字段。

好的，我可以帮你解答这个问题。下面是Java语言创建一个简单的计算器的代码示例：

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

public class Calculator extends JFrame implements ActionListener {

    private JLabel resultLabel;
    private JTextField inputField;
    private JButton clearButton;
    private JButton addButton;
    private JButton subtractButton;
    private JButton multiplyButton;
    private JButton divideButton;
    private double accumulator;

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

        // Create the components
        resultLabel = new JLabel("0.0");
        inputField = new JTextField(10);
        clearButton = new JButton("CLR");
        addButton = new JButton("+");
        subtractButton = new JButton("-");
        multiplyButton = new JButton("*");
        divideButton = new JButton("/");

        // Add components to the content pane
        Container c = getContentPane();
        c.setLayout(new BorderLayout());
        JPanel topPanel = new JPanel(new FlowLayout());
        topPanel.add(resultLabel);
        c.add(topPanel, BorderLayout.NORTH);
        JPanel centerPanel = new JPanel(new FlowLayout());
        centerPanel.add(inputField);
        c.add(centerPanel, BorderLayout.CENTER);
        JPanel bottomPanel = new JPanel(new FlowLayout());
        bottomPanel.add(clearButton);
        bottomPanel.add(addButton);
        bottomPanel.add(subtractButton);
        bottomPanel.add(multiplyButton);
        bottomPanel.add(divideButton);
        c.add(bottomPanel, BorderLayout.SOUTH);

        // Register event handlers
        clearButton.addActionListener(this);
        addButton.addActionListener(this);
        subtractButton.addActionListener(this);
        multiplyButton.addActionListener(this);
        divideButton.addActionListener(this);

        // Initialize the accumulator
        accumulator = 0.0;
    }

    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        if (command.equals("CLR")) {
            accumulator = 0.0;
            resultLabel.setText("0.0");
            inputField.setText("");
        } else {
            try {
                double value = Double.parseDouble(inputField.getText());
                if (command.equals("+")) {
                    accumulator += value;
                } else if (command.equals("-")) {
                    accumulator -= value;
                } else if (command.equals("*")) {
                    accumulator *= value;
                } else if (command.equals("/")) {
                    accumulator /= value;
                }
                resultLabel.setText(Double.toString(accumulator));
                inputField.setText("");
            } catch (NumberFormatException ex) {
                inputField.setText("");
            }
        }
    }

    public static void main(String[] args) {
        Calculator calc = new Calculator();
        calc.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        calc.setSize(200, 160);
        calc.setVisible(true);
    }

}

这个程序创建了一个名为 Calculator 的窗口应用程序，其中包含一个显示标签、一个文本框和几个按钮。累加器状态变量 accumulator 跟踪当前计算的总体值，初始化为 0.0。点击 CLR 按钮将累加器值设置为 0.0，点击 + 按钮将文本字段值添加到累加器值中，点击 - 按钮从累加器值中减去文本字段值，点击 * 按钮，累加器值乘以文本字段值，点击 / 按钮，累加器值除以文本字段值。按下按钮后，用新的累加器更新显示标签，清空文本字段。