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Item 7: Eliminate obsolete object references

Effective Java 3rd edition

일반적으로 Memory Leaking이 일어나는 경우는 3가지

  1. 사용하지 않는 object reference가 nulling out 되지 않는 경우
    -> 사용하지 않는 reference는 명시적으로 null out 해줘야 한다.

  2. 캐시
    -> WeakHashMap으로 캐시를 다룬다??

  3. listeners and other callbacks
    -> WeakHashMap ??

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