What are the differences between ArrayList and LinkedList? java interview questions....

Answer: 

• it's is a List implementation backed by a Java array, like Vector class

•  If there are lots of growth periods, performance degrades as the old array needs to be copied into the new array.

•  However, random access is very quick as it uses an array index to access.

• LinkedList, the List implementation is backed by a doubly linked list data structure, allowing easy inserts/deletions anywhere in the structure, but really slow random accesses as the access must start at an end to get to the specific position.

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java interview questions ...

What is a static method? java interview questions..

Ans:

• Static variables are always called by the class name.

• Class variables or static variables are declared with the static keyword in a class. These are declared outside a class and stored in static memory.

• The scope of the class variable is same an instance variable. 

• A static variable is associated with the class as a whole rather than with specific instances of a class. Each object will share a common copy of the static variables .

•  Class variables are mostly used for constants Its initial value is same as instance variable and gets a default value when its not initialized corresponding to the data type.

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