JPanel panel=new JPanel();
BoxLayout layout=new BoxLayout(panel, BoxLayout.X_AXIS);
panel.setLayout(layoout);
panel.add(new JButton("hello"));
panel.add(new JButton("wolrd"));

import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;public class BoxLayoutDemo extends JPanel {JPanel sportPanel;JPanel queryPanel;JPanel middlePanel;public BoxLayoutDemo() {// 主面板由3个子面板组成，在水平方向排列setLayout(new BoxLayout(this, BoxLayout.X_AXIS));this.setSportPanel();this.setMiddlePanel();this.setQueryPanel();this.add(sportPanel);this.add(middlePanel);this.add(queryPanel);}private void setSportPanel() {System.out.println("setSportPanel called");//本函数内包含以下两个控件JLabel sourceLabel;//文字标签JScrollPane sourceListScroller;//滚动条//文字标签sourceLabel = new JLabel("运动项目");sourceLabel.setAlignmentY(TOP_ALIGNMENT);sourceLabel.setBorder(BorderFactory.createEmptyBorder(4, 5, 0, 5));// 创建一个列表，包含运动项目DefaultListModel<String> listModel = new DefaultListModel<String>();listModel.addElement("100米");listModel.addElement("200米");listModel.addElement("400米");listModel.addElement("跳远");listModel.addElement("跳高");listModel.addElement("铅球");JList<String> sourceList = new JList<String>(listModel);sourceList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);sourceList.setVisibleRowCount(5);//初始状态保持5行可见//滚动条sourceListScroller = new JScrollPane(sourceList);sourceListScroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);sourceListScroller.setAlignmentY(TOP_ALIGNMENT);//开始布局主面板sportPanel = new JPanel();        sportPanel.setLayout(new BoxLayout(sportPanel, BoxLayout.Y_AXIS));// 垂直布局sportPanel.setBorder(BorderFactory.createBevelBorder(1));sportPanel.add(sourceLabel);// 加入文字标签到sportPanel.add(sourceListScroller);// 加入运动项目列表
}private void setMiddlePanel() {//本函数包含2个按钮JButton toTargetButton = new JButton(">>");JButton toSourceButton = new JButton("<<");//布局主面板middlePanel = new JPanel();middlePanel.setBorder(BorderFactory.createBevelBorder(1));middlePanel.setLayout(new BoxLayout(middlePanel, BoxLayout.Y_AXIS));//主面板为垂直布局
        middlePanel.add(toTargetButton);// 添加第一个按钮>>middlePanel.add(Box.createRigidArea(new Dimension(15, 15)));// 中间添加一个看不见的rigidAreamiddlePanel.add(toSourceButton);// 添加第二个按钮<<
    }private void setQueryPanel() {//本函数包含2个控件
        JLabel targetLabel;JScrollPane targetListScroller;// 文字标签targetLabel = new JLabel("查询项目");targetLabel.setAlignmentY(TOP_ALIGNMENT);targetLabel.setBorder(BorderFactory.createEmptyBorder(4, 5, 0, 5));// 创建列表查询项目DefaultListModel<String> targetListModel = new DefaultListModel<String>();targetListModel.addElement("100米");JList<String> targetList = new JList<String>(targetListModel);targetList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);//滚动条targetListScroller = new JScrollPane(targetList);targetListScroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);targetListScroller.setAlignmentY(TOP_ALIGNMENT);//设置主面板布局queryPanel = new JPanel();        queryPanel.setLayout(new BoxLayout(queryPanel, BoxLayout.Y_AXIS));// 垂直布局queryPanel.setBorder(BorderFactory.createBevelBorder(1));queryPanel.add(targetLabel);//添加文字标签queryPanel.add(targetListScroller);//添加滚动条
    }public static void main(String[] args) {JFrame frame = new JFrame("BoxlayoutDemo");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setContentPane(new BoxLayoutDemo());frame.pack();// frame.repaint();frame.setLocationRelativeTo(null);frame.setVisible(true);}}