练习一、【jsplitpane】分割面板，一次性把两个组件显示在一个分割面板之中。JSplitPane用于划分两个（也只有两个） Components。

import java.awt.Color;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;

public class JSplitPaneTest extends JFrame implements ActionListener {
    JPanel p,p1,p2;
    JButton b;
    JSplitPane sp;
    int ore=0;

    public JSplitPaneTest() {
        p=new JPanel();
        p1=new JPanel();
        p2=new JPanel();

        b=new JButton("改变");

        p1.setBackground(Color.green);
        p2.setBackground(Color.RED);

        sp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,p1,p2);
        //参数分别是：分割线的位置（水平分割还是垂直分割）；要放的组件1；要放的组件2

        p.add(b);
        this.add("Center", sp);
        this.add("South", p);

        this.setSize(300, 300);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }
    public static void main(String[] args) {
        new JSplitPaneTest();
    }

}

练习二、点击按钮，改变分割线的位置

package org.zhaiyujia.pkg1;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSplitPane;

public class JSplitPaneTest extends JFrame implements ActionListener {
    JPanel p,p1,p2;
    JButton b;
    JSplitPane sp;
    int ore=0;

    public JSplitPaneTest() {
        p=new JPanel();
        p1=new JPanel();
        p2=new JPanel();

        b=new JButton("改变");

        p1.setBackground(Color.green);
        p2.setBackground(Color.RED);

        sp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,p1,p2);
        //参数分别是：分割线的位置（水平分割还是垂直分割）；要放的组件1；要放的组件2.
        //放容器组件有优势（可以在它上面继续放其他非容器组件），也可以直接放非容器组件

        p.add(b);
        this.add("Center", sp);
        this.add("South", p);

        this.setSize(300, 300);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        b.addActionListener(this);
    }   
    public static void main(String[] args) {
        new JSplitPaneTest();
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        if(ore==0) {
            sp.setOrientation(JSplitPane.VERTICAL_SPLIT);
            ore=1;
        }else {
            sp.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
            ore=0;
        }



    }

}

练习三、【setOneTouchExpandable(boolean newValue) 】设置 oneTouchExpandable属性的值，它们必须为 true为 JSplitPane提供一个UI小部件在分隔符上以快速扩展/折叠分频器。