异常注意事项

public  int  f(){
    try{
        String demo=null;
        demo.split("a");
        System.out.println("try");
    }catch(Exception e){
        System.out.println("catch");
    }finally{
        System.out.println("finally");
    }
}
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        haha a=new haha();
        a.f();
    }
}