如何使得按多个按钮传到文本框上面，就是字符串拼接，用添加事件来写，代码实现

好的，下面是一个基于添加事件的字符串拼接示例代码：

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

public class Calculator extends JFrame implements ActionListener {
    private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9;
    private JButton buttonPlus, buttonMinus, buttonMultiply, buttonDivide, buttonEqual, buttonClear;
    private JTextField textField;

    private String text = "";

    public Calculator() {
        setTitle("简单计算器");
        setLayout(new BorderLayout());

        textField = new JTextField();
        textField.setEditable(false);
        add(textField, BorderLayout.NORTH);

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(4, 4));

        button7 = addButton("7", buttonPanel);
        button8 = addButton("8", buttonPanel);
        button9 = addButton("9", buttonPanel);
        buttonPlus = addButton("+", buttonPanel);
        button4 = addButton("4", buttonPanel);
        button5 = addButton("5", buttonPanel);
        button6 = addButton("6", buttonPanel);
        buttonMinus = addButton("-", buttonPanel);
        button1 = addButton("1", buttonPanel);
        button2 = addButton("2", buttonPanel);
        button3 = addButton("3", buttonPanel);
        buttonMultiply = addButton("*", buttonPanel);
        button0 = addButton("0", buttonPanel);
        buttonClear = addButton("C", buttonPanel);
        buttonEqual = addButton("=", buttonPanel);
        buttonDivide = addButton("/", buttonPanel);

        add(buttonPanel, BorderLayout.CENTER);

        pack();
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    private JButton addButton(String label, JPanel panel) {
        JButton button = new JButton(label);
        button.addActionListener(this);
        panel.add(button);
        return button;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String buttonValue = e.getActionCommand();
        switch (buttonValue) {
            case "C":
                text = "";
                break;
            case "=":
                calculate();
                break;
            default:
                text += buttonValue;
                break;
        }
        textField.setText(text);
    }

    private void calculate() {
        // 进行计算，这里省略具体实现
        text = "";
    }

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

在这个例子中，我们创建了一个简单的计算器界面，包含了数字和操作符的按钮以及一个文本框。每当用户点击按钮时，程序会调用actionPerformed方法，将按钮对应的字符拼接到text字符串中，并在文本框中显示拼接后的字符串。当用户点击清空按钮或计算按钮时，我们会清空text字符串或进行计算，并更新文本框中的内容。

需要注意的是，我们在创建按钮时调用了addButton方法，并将当前对象作为ActionListener传入。这样，当用户点击按钮时，程序就会调用该对象的actionPerformed方法，从而实现字符串拼接和计算等功能。