用java编写一个计算器并且界面搜索栏下面加三个案件

好的，下面是一个简单的Java计算器的实现，包括搜索栏和三个自定义按钮：

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

public class Calculator extends JFrame {
    private JTextField textField;
    private JButton addButton, subtractButton, multiplyButton;
    private JButton customButton1, customButton2, customButton3;
    private JPanel buttonPanel;

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

        // 创建搜索栏
        JPanel searchPanel = new JPanel();
        JLabel searchLabel = new JLabel("Search:");
        JTextField searchField = new JTextField(20);
        JButton searchButton = new JButton("Go");
        searchPanel.add(searchLabel);
        searchPanel.add(searchField);
        searchPanel.add(searchButton);

        // 创建显示屏
        textField = new JTextField(20);
        textField.setEditable(false);
        textField.setHorizontalAlignment(JTextField.RIGHT);

        // 创建按钮面板
        buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 4));

        // 创建数字按钮
        for (int i = 0; i < 10; i++) {
            JButton button = new JButton(String.valueOf(i));
            button.addActionListener(new DigitButtonActionListener(i));
            buttonPanel.add(button);
        }

        // 创建运算符按钮
        addButton = new JButton("+");
        addButton.addActionListener(new OperationButtonActionListener('+'));
        subtractButton = new JButton("-");
        subtractButton.addActionListener(new OperationButtonActionListener('-'));
        multiplyButton = new JButton("*");
        multiplyButton.addActionListener(new OperationButtonActionListener('*'));
        JButton divideButton = new JButton("/");
        divideButton.addActionListener(new OperationButtonActionListener('/'));
        JButton clearButton = new JButton("C");
        clearButton.addActionListener(new ClearButtonActionListener());
        JButton equalButton = new JButton("=");
        equalButton.addActionListener(new EqualButtonActionListener());

        // 添加自定义按钮
        customButton1 = new JButton("Button1");
        customButton1.addActionListener(new CustomButtonActionListener(1));
        customButton2 = new JButton("Button2");
        customButton2.addActionListener(new CustomButtonActionListener(2));
        customButton3 = new JButton("Button3");
        customButton3.addActionListener(new CustomButtonActionListener(3));

        // 将按钮添加到面板
        buttonPanel.add(addButton);
        buttonPanel.add(subtractButton);
        buttonPanel.add(multiplyButton);
        buttonPanel.add(divideButton);
        buttonPanel.add(customButton1);
        buttonPanel.add(customButton2);
        buttonPanel.add(customButton3);
        buttonPanel.add(clearButton);
        buttonPanel.add(new JButton(""));
        buttonPanel.add(new JButton(""));
        buttonPanel.add(new JButton(""));
        buttonPanel.add(equalButton);

        // 添加组件到窗口
        Container contentPane = getContentPane();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(searchPanel, BorderLayout.NORTH);
        contentPane.add(textField, BorderLayout.CENTER);
        contentPane.add(buttonPanel, BorderLayout.SOUTH);

        // 设置窗口属性
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 300);
        setVisible(true);
    }

    // 数字按钮的事件处理器
    private class DigitButtonActionListener implements ActionListener {
        private int digit;

        public DigitButtonActionListener(int digit) {
            this.digit = digit;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + String.valueOf(digit));
        }
    }

    // 运算符按钮的事件处理器
    private class OperationButtonActionListener implements ActionListener {
        private char operator;

        public OperationButtonActionListener(char operator) {
            this.operator = operator;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + " " + operator + " ");
        }
    }

    // 清除按钮的事件处理器
    private class ClearButtonActionListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            textField.setText("");
        }
    }

    // 等号按钮的事件处理器
    private class EqualButtonActionListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            String[] tokens = textField.getText().split(" ");
            double result = Double.parseDouble(tokens[0]);
            for (int i = 1; i < tokens.length; i += 2) {
                char operator = tokens[i].charAt(0);
                double operand = Double.parseDouble(tokens[i+1]);
                switch (operator) {
                    case '+':
                        result += operand;
                        break;
                    case '-':
                        result -= operand;
                        break;
                    case '*':
                        result *= operand;
                        break;
                    case '/':
                        result /= operand;
                        break;
                }
            }
            textField.setText(String.valueOf(result));
        }
    }

    // 自定义按钮的事件处理器
    private class CustomButtonActionListener implements ActionListener {
        private int buttonId;

        public CustomButtonActionListener(int buttonId) {
            this.buttonId = buttonId;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            textField.setText(textField.getText() + " Button" + buttonId);
        }
    }

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

在上面的代码中，我们使用了Java Swing库来创建计算器的界面。在按钮的事件处理器中，我们实现了基本的加减乘除运算和清除操作。同时，我们添加了三个自定义按钮，并在自定义按钮的事件处理器中实现了它们的功能。