具体代码

package org.example;

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

public class Main extends JFrame {
    public static JFrame jFrame;
    public static JPanel jPanel=new JPanel();
    public static JScrollPane jScrollPane=new JScrollPane(jPanel,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
    public static void main(String[] args) {
        jFrame=new JFrame("测试滚动条界面");
        jFrame.setSize(600,400);
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jFrame.setLocationRelativeTo(null);



        //设置组件
        jFrame.add(jScrollPane);
        jPanel.setPreferredSize(new Dimension(800,2000));


        jFrame.setVisible(true);
    }
}