Immutable classes are classes whose objects can't be modified
once they are created.
1. Immutable String ensures that there is no security
threat to Java classes when used as
a parameter for many Java classes like class loading mechanism, network
connection, opening files, etc.
2. String pool is a special storage area in Java heap
where String objects are typically stored. When a String is created and if the
String already exists in the pool, the reference to the existing String will be
returned instead of creating a new String.
3. The hashcode of String is frequently used in
Java. Being immutable ensures that the hashcode of the String is cached, not
created every time and will always be the same, which makes it more efficient
when used as key in HashMap.
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