摆动组件位置不正确

本文介绍了摆动组件位置不正确的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想在JFrame的底部具有按钮btn.我在右边.我的代码中的错误在哪里?

I woud like to have button btn at the bottom of a JFrame. I have this in right side. Where is bug in my code?

class MainClass extends JFrame { private JSplitPane splitPan=null; private void treePanel(){ DefaultMutableTreeNode nod=new DefaultMutableTreeNode("AAA",true); nod.add(new DefaultMutableTreeNode("abcd")); JTree tree=new JTree(nod); JScrollPane scroll=new JScrollPane(tree); splitPan=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll,new JLabel("aaaaa")); splitPan.setSize(this.getMaximumSize()); add(splitPan); } public MainClass() { setLayout(new BoxLayout(getContentPane(), BoxLayout.X_AXIS)); treePanel(); add(new JButton("btn")); pack(); setDefaultCloseOperation(EXIT_ON_CLOSE); setSize(300,200); setVisible(true); } }

推荐答案

BoxLayout.Y_AXIS.可见.

import javax.swing.*; import javax.swing.tree.*; class MainClass extends JFrame { private JSplitPane splitPan=null; private void treePanel(){ DefaultMutableTreeNode nod=new DefaultMutableTreeNode("AAA",true); nod.add(new DefaultMutableTreeNode("abcd")); JTree tree=new JTree(nod); JScrollPane scroll=new JScrollPane(tree); splitPan=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll,new JLabel("aaaaa")); splitPan.setSize(this.getMaximumSize()); add(splitPan); } public MainClass() { // this is it! setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS)); treePanel(); add(new JButton("btn")); pack(); setDefaultCloseOperation(EXIT_ON_CLOSE); setSize(300,200); setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new MainClass(); } }); } }