The most direct manifestation of memory leak

java The most direct manifestation of program memory leakage is （ ）

a         frequent FullGc
b        jvm Crash program 
c         Throw memory overflow Exception
d        java The process exception disappears 

answer ：c

A memory leak is when the object reference disappears , Object memory is not recycled

A answer ：FullGC It's when there's not enough memory space in the old days , Will trigger , The old age is generally an object with a long life cycle or a large object , Frequent FullGC It may not affect program performance （ Because memory recycling takes CPU And so on ）, But it will not directly lead to memory leakage .

B answer ：JVM The crash may be caused by memory overflow , It may also be caused by other factors JVM Crash operation , For example, the wrong is set JVM Parameters, etc. .

C answer ： Memory exception , The most common Namely StackOverFlow The put , out of memory , In fact, the final result of memory leak is memory overflow .

D answer ：Java The process exception disappears , This is obviously wrong .