Is Integer a Class or variable
where can static keyword used ?
Adv and Disadv of using Static variable
what are things need to keep in mind when using static variable
how can we apply locks static variable or how can we make sure static variable is not tamper with
Java Complier and JVM - which on start first
Abstract vs Interface
why we need interface when abstract can do same stuff for us
Can you use Interface.method?

Question

Is Integer a Class or variable
 where can static keyword used ?
Adv and Disadv of using Static variable
what are things need to keep in mind when using static variable
how can we apply locks static variable or how can we make sure static variable is not tamper with
Java Complier and JVM - which on start first
Abstract vs Interface
why we need interface when abstract can do same stuff for us
Can you use Interface.method?

Sarty · Accepted Answer

Interface is introduced to implment multiple inheritance in java.We can extend one abstract class at a time where we can implement many interfaces.

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