如何始终显示垂直和水平滚动条，即使不需要
java 8object oriented programmingprogramming更新于 2025/8/29 2:52:17
使用以下常量为 JScrollBar 始终显示垂直和水平滚动条，即使不需要 −
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
以下是始终显示垂直和水平滚动条的示例，即使不需要 −
示例
package my;
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
public class SwingDemo {
public static void main(String args[]) {
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton button1 = new JButton("Questions and Answers");
JButton button2 = new JButton("Videos");
JButton button3 = new JButton("Tools");
JButton button4 = new JButton("Tutorials");
JButton button5 = new JButton("Online Compiler");
JButton button6 = new JButton("Quiz");
Box box = Box.createVerticalBox();
box.setPreferredSize(new Dimension(900,900));
box.add(button1);
box.add(button2);
box.add(button3);
box.add(button4);
box.add(button5);
box.add(button6);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setViewportView(box);
scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setSize(550, 250);
frame.setVisible(true);
}
}
输出
