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Friends! if you like this post ,please comment below and share it to your friends :) Under The Hood Of The Compiler   Compiler Messages What is an "unchecked" warning? A warning by which the compiler indicates that it cannot ensure type safety. The term "unchecked" warning is misleading.  It does not mean that the warning is unchecked in any way.  The term "unchecked" refers to the fact that the compiler and the runtime system do not have enough type information to perform all type checks that would be necessary to ensure type safety. In this sense, certain operations are "unchecked". The most common source of "unchecked" warnings is the use of raw types.  "unchecked" warnings are issued when an object is accessed through a raw type variable, because the raw type does not provide enough type information to perform all necessary type checks. Example (of unchecked warning in conjunction with raw types):   Tre