Strings are the most commonly used objects in any Java program. They are used for storing a collection of characters. These characters when combined form a String with the property that the contents of the String can not be changed once created.
String Usage in Java
Strings are used invariably with every other concept in Java be it Multi-threading , Serialization, Reflection, Collection, and Exceptions etc. But strings usage can also lead to improper programs being created with subtle issues like memory leaks and performance overhead.