Item 4: Avoid Creating Duplicate Objects

Principle 1:
Immutable classes should be static!
“An object can always be reused if it is immutable”

Stupid:
String s = new String(“Silly Billy”); // NO NO NO

Good:
String s = “No Longer a silly Billy”

Principle 2:
You get special cases where you can re-use the mutable object that will not be modified.

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