请阅读下面的程序代码Class Person{void say(){System.out.println("hello");}}class Example{public static void main(String[] args){Person p2 = new Person();Person p1 = new Person(); p2.say();p1.say();p2=null;p2.say();}}下列关于程序运行结果的描述中,正确的是()
答:输出2个hello后会抛出异常
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