JFrame中的JScrollPane重叠

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

public class ScrollPaneExample {
    public static void main(String[] args) {
        // 创建JFrame实例
        JFrame frame = new JFrame("JScrollPane Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 300);

        // 创建一个大的JTextArea，它将超出JFrame的可视区域
        JTextArea textArea = new JTextArea(20, 50);
        textArea.setText("This is a JTextArea that will be placed inside a JScrollPane.\n" +
                "It has more content than can be displayed in the JFrame at once,\n" +
                "so scrollbars will appear to allow the user to view all the content.");

        // 创建JScrollPane并将JTextArea添加到其中
        JScrollPane scrollPane = new JScrollPane(textArea);

        // 将JScrollPane添加到JFrame
        frame.add(scrollPane, BorderLayout.CENTER);

        // 显示JFrame
        frame.setVisible(true);
    }
}