public void showMainUI(){
		this.setTitle("JavaKe:"+jkNum);
		java.awt.FlowLayout fl=new java.awt.FlowLayout();
		this.setLayout(fl);
		this.setSize(200,700);
		JMenuBar mb=getMB();//ӽϵĲ˵
		this.setJMenuBar(mb);
		this.add(userTree);
		this.setVisible(true);
		this.setDefaultCloseOperation(3);
	}