java布局 - Java / Java SE

我做了一个界面，上面是菜单栏，接着是工具栏showPanel，接下来是左(actionalPanel)右(contentPanel)面板，左右面板中间用分隔线(jsplit)隔开，
可是在加到界面上时却不成功显示，我的代码如下：Java code:

private void init(){

//初始化菜单
open.addActionListener(new Act_OpenFile());
exit.addActionListener(new Act_Exit());

//funOntology.addActionListener(new Act_FunOnto());
funOntology.addActionListener(new Act_fun());
devOntology.addActionListener(new Act_devOnto());
wayOfAch.addActionListener(new Act_WayOfAch());
funTree.addActionListener(new Act_FunTree());
showHelp.addActionListener(new Act_Help());

mb.add(m1);

m1.add(open);
m1.add(exit);

m2.add(funOntology);
m2.add(devOntology);
m2.add(wayOfAch);
m2.add(funTree);

m3.add(showHelp);

mb.add(m2);
mb.add(m3);

setJMenuBar(mb);

button1 = new JButton( "pre ");
button2 = new JButton( "next ");
button3 = new JButton( "end ");
toolBar.add(button1);
toolBar.add(button2);
toolBar.add(button3);
toolBar.add(toolT