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|Interview Questions and Answers|
|Ans. With Collection classes , we cannot use primitive types. Moreover for any class using generic types, we cannot use primitive types.|
They add more functionality by means of additional methods.
As their reference can be null , they offer consistent check for uninitialized state.
They facilitate caching and reuse by means of constant Pools.
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|Like Discuss Correct / Improve  wrapper classes  benefits of wrapper classes over primitives|
|Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?|
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|Difference between boolean and Boolean ?|
|What are Wrapper Classes ? What are Primitive Wrapper Classes ?|
|What Design pattern Wrapper Classes implement ?|
|Can we compare Integers by using equals() in Java ?|