2. Memory leak and memory overflow

One ： Definition

<1> Memory leak ：

         The memory of objects that will no longer be used will not be recycled , It's a memory leak .        

                for example ： Strongly referenced objects are not recycled , May cause memory leaks .

                 A more popular explanation is when using resources , It opens up a space for this resource , But no resources are released after use . Resources are always in memory , This leads to a memory leak . When the number of memory leaks reaches a certain level, it becomes a memory overflow .

 <2> out of memory ：

         When the program applies for memory , There is not enough memory for applicants .

                A more popular explanation is that the space we need to use is larger than the memory we have. Memory overflow caused by insufficient memory

Two ： example

Memory leak ：

        ThreadLocal Memory leak