我想讓我的JFrame有一個BoxLayout能夠有一個滾動窗格,所以我可以繼續添加組,如果它是收據或發票打印機.有沒有辦法添加ScrollPane？

問題：如何將ScrollPane添加到JFrame？

代碼,最初見過here：

import java.awt.EventQueue;

import javax.swing.BorderFactory;

import javax.swing.Box;

import javax.swing.BoxLayout;

import javax.swing.GroupLayout;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextField;

/** @see https://stackoverflow.com/a/8504753/230513 */

public class GroupPanel extends JPanel {

private static final long serialVersionUID = 1L;

private JLabel label1 = new JLabel("Primary:");

private JTextField field1 = new JTextField(16);

private JLabel label2 = new JLabel("Secondary:");

private JTextField field2 = new JTextField(16);

private JLabel label3 = new JLabel("Tertiary:");

private JTextField field3 = new JTextField(16);

JScrollPane sp = new JScrollPane();

public GroupPanel(int n) {

this.setBorder(BorderFactory.createTitledBorder("Panel " + n));

GroupLayout l = new GroupLayout(this);

this.setLayout(l);

l.setAutoCreateGaps(true);

l.setAutoCreateContainerGaps(true);

l.setHorizontalGroup(l.createSequentialGroup()

.addGroup(l.createParallelGroup(GroupLayout.Alignment.TRAILING)

.addComponent(label1)

.addComponent(label2)

.addComponent(label3))

.addGroup(l.createParallelGroup(GroupLayout.Alignment.LEADING)

.addComponent(field1)

.addComponent(field2)

.addComponent(field3))

);

l.setVerticalGroup(l.createSequentialGroup()

.addGroup(l.createParallelGroup(GroupLayout.Alignment.BASELINE)

.addComponent(label1)

.addComponent(field1))

.addGroup(l.createParallelGroup(GroupLayout.Alignment.BASELINE)

.addComponent(label2)

.addComponent(field2))

.addGroup(l.createParallelGroup(GroupLayout.Alignment.BASELINE)

.addComponent(label3)

.addComponent(field3))

);

sp.setToolTipText("test");

sp.add(this);

}

private static void display() {

JFrame f = new JFrame("GroupPanel");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().setLayout(new BoxLayout(f.getContentPane(), BoxLayout.Y_AXIS));

f.getContentPane().add(new GroupPanel(1));

f.getContentPane().add(new GroupPanel(2));

f.getContentPane().add(new GroupPanel(3));

f.getContentPane().add(new GroupPanel(4));

f.getContentPane().add(Box.createVerticalGlue());

f.pack();

f.setLocationRelativeTo(null);

f.setVisible(true);

}

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

display();

}

});

}

}

解決方法:

只需將所有組件首先包含在JPanel中,然后將其添加到JScrollPane中,最后將JScrollPane添加到JFrames內容窗格中.

示例代碼：

JPanel panel = new JPanel();

JScrollPane scrollPane = new JScrollPane(panel);

panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

panel.add(new GroupPanel(1));

panel.add(new GroupPanel(2));

panel.add(new GroupPanel(3));

panel.add(new GroupPanel(4));

panel.add(Box.createVerticalGlue());

f.getContentPane().add(scrollPane);

屏幕截圖;

標簽：boxlayout,java,swing,jpanel,jscrollpane

來源： https://codeday.me/bug/20190830/1770715.html

總結

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