请编写一个Java程序实现如下图所示的“简易计算器”窗口（CalculatorFrame）

好的，我可以为你编写一个简易计算器窗口的Java程序。下面是代码实现：

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

public class CalculatorFrame extends JFrame implements ActionListener {
    private JTextField displayField;
    private JButton[] numberButtons;
    private JButton addButton, subButton, mulButton, divButton, equalButton, clearButton;

    private String currentOperator = null;
    private int currentValue = 0;

    public CalculatorFrame() {
        super("简易计算器");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 显示区域
        displayField = new JTextField("0", 20);
        displayField.setEditable(false);
        JPanel displayPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
        displayPanel.add(displayField);
        add(displayPanel, BorderLayout.NORTH);

        // 数字按钮
        numberButtons = new JButton[10];
        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new JButton("" + i);
            numberButtons[i].addActionListener(this);
        }

        // 操作符按钮
        addButton = new JButton("+");
        subButton = new JButton("-");
        mulButton = new JButton("*");
        divButton = new JButton("/");
        equalButton = new JButton("=");
        clearButton = new JButton("C");

        addButton.addActionListener(this);
        subButton.addActionListener(this);
        mulButton.addActionListener(this);
        divButton.addActionListener(this);
        equalButton.addActionListener(this);
        clearButton.addActionListener(this);

        // 按钮区域
        JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
        buttonPanel.add(numberButtons[7]);
        buttonPanel.add(numberButtons[8]);
        buttonPanel.add(numberButtons[9]);
        buttonPanel.add(addButton);
        buttonPanel.add(numberButtons[4]);
        buttonPanel.add(numberButtons[5]);
        buttonPanel.add(numberButtons[6]);
        buttonPanel.add(subButton);
        buttonPanel.add(numberButtons[1]);
        buttonPanel.add(numberButtons[2]);
        buttonPanel.add(numberButtons[3]);
        buttonPanel.add(mulButton);
        buttonPanel.add(clearButton);
        buttonPanel.add(numberButtons[0]);
        buttonPanel.add(equalButton);
        buttonPanel.add(divButton);
        add(buttonPanel, BorderLayout.CENTER);

        pack();
        setLocationRelativeTo(null);
    }

    public void actionPerformed(ActionEvent event) {
        Object source = event.getSource();
        if (source == clearButton) {
            currentOperator = null;
            currentValue = 0;
            displayField.setText("0");
        } else if (source == equalButton) {
            if (currentOperator != null) {
                int value = Integer.parseInt(displayField.getText());
                switch (currentOperator) {
                    case "+":
                        currentValue += value;
                        break;
                    case "-":
                        currentValue -= value;
                        break;
                    case "*":
                        currentValue *= value;
                        break;
                    case "/":
                        currentValue /= value;
                        break;
                }
                displayField.setText("" + currentValue);
                currentOperator = null;
            }
        } else if (source == addButton || source == subButton || source == mulButton || source == divButton) {
            if (currentOperator != null) {
                int value = Integer.parseInt(displayField.getText());
                switch (currentOperator) {
                    case "+":
                        currentValue += value;
                        break;
                    case "-":
                        currentValue -= value;
                        break;
                    case "*":
                        currentValue *= value;
                        break;
                    case "/":
                        currentValue /= value;
                        break;
                }
                displayField.setText("" + currentValue);
            } else {
                currentValue = Integer.parseInt(displayField.getText());
            }
            currentOperator = ((JButton) source).getText();
            displayField.setText("0");
        } else {
            String text = displayField.getText();
            if (text.equals("0")) {
                text = "";
            }
            text += ((JButton) source).getText();
            displayField.setText(text);
        }
    }

    public static void main(String[] args) {
        CalculatorFrame frame = new CalculatorFrame();
        frame.setVisible(true);
    }
}

你可以在本地运行该代码，打开一个简易计算器窗口，可以进行加减乘除的计算。注意，这里使用了Java的GUI库Swing来实现窗口和按钮，使用了事件监听器ActionListener来处理按钮点击事件，实现了简单的计算器功能。