Question

JAVA中jpanel加滚动条为什么加不成功

package FoodPanel;

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.RoundRectangle2D;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;

public class CookiePanel extends JPanel {
public CookiePanel()
{

this.setBounds(200, 120, 800, 490);
this.setBackground(null);
this.setOpaque(false);
//this.setPreferredSize(null);
this.setLayout(new FlowLayout(FlowLayout.LEFT,30,20));

JScrollPane scroll = new JScrollPane();
//scroll.setBounds(0,120, 1600, 290);
//scroll.setBackground(null);
//scroll.setOpaque(false);
//scroll.getViewport().setOpaque(false);
//scroll.setBorder(null);
this.add(scroll);

}

}

Answer 1

JScrollPane scroll = new JScrollPane(JPanel);请吧需要添加滚动的Jpanel放到JScrollPanel的构造函数中。

然后再需要添加JPanle的位置，将这个放置了Jpanel的JscrollPanel添加进去。