2. creating and destroying objects

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ref: book "Effective Java"

1. consider static factory methods instead of constructord

2. consider a builder when faced with many constructor parameters

3. enforce the singleton property with a private constructor or an enum type

4. enforce noninstantiability with a private constructor

5. avoid creating unnecessary objects

6. avoid finalizer

2. creating and destroying objects

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原文地址：http://www.cnblogs.com/morningdew/p/5645071.html