1)All of its fields are final
2)The class is declared final
3)The this reference is not allowed to escape during construction
4)Any fields that contain references to mutable objects, such as arrays, collections, or mutable classes like Date:
-Are private
-Are never returned or otherwise exposed to callers
-Are the only reference to the objects that they reference
-Do not change the state of the referenced objects after construction
Refer java.lang.String
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