帮忙看下这段代码，为啥那个afafafa没有打印出来？

public class Demoe {
  public  void f()  {
    System.out.println("Throwing MyException from f()");

   }
  public static void main(String[] args) {
   Demoe aa = null;



    try {
        aa.f();  throw new NullPointerException("afafafa");
    } catch(NullPointerException e) {
        System.out.println("Caught Exception1"+e.getMessage());
        e.printStackTrace();
    } finally {
        System.out.println("Made it to finally");
    }

}   

}

Caught Exception1null   为啥那个afafafa没有打印出来，getMessage()不是打印的异常的详细消息字符串吗？
 java.lang.NullPointerException
    at Demoe.main(Demoe.java:14)
Made it to finally

 try {
        aa.f();  //执行到这一句就报空指针了，aa=null
                throw new NullPointerException("afafafa");//这句还没执行到
    } catch(NullPointerException e) {
        System.out.println("Caught Exception1"+e.getMessage());
        e.printStackTrace();
    }

把throw 异常的逻辑放在方法f()中，然后在再main中捕获异常

nullpointerexception

java.lang.NullPointerException

                空指针
                                    指代错误或者是位置放错

要先 Demo aa = new Demo();