Effective Java 3/E summary chanpter 1 (Shorter version)

22 Dec 2020

Chanpter 1 : Creating and Destroying Objects

Item 1~5

You can find the longer version of this summary here.

Object creation patterns

• Default constructor
• Static factory method pattern
• Telescoping constructor pattern
• Java Beans pattern
• Builder pattern

Things to consider before object creation

• Will it be used as a singleton?
• Is it a utility class?
• Is it a class that implements an interface?
• Will it allow inheritance?
• How many parameters are required?

Item 6~9

You can find the longer version of this summary here.

Efficient object management

• Reuse immutable objects
• Always minimize the scope
• Watch out for memory leaks in the following situations
  • Class that directly manages memory
  • Use of cache (considering WeakHashMap)
  • Listener, Callback
• Don’t use object destructor finalizer, cleaner
  • As an alternative, use AutoCloseable + try-with-resources syntax