Java Interview Uncommon Questions With Answers

How to detect a loop in LinkedList?
Traverse the list one by one and keep putting the node addresses in a HashTable. At any point if NULL is reached then return false and if next of the current node point to any of the previously stored nodes in HashTable then return true.

What is SOLID Principle?
Single-responsibility principle
class should only have a single responsibility, that is, only changes to one part of the software's specification should be able to affect the specification of the class.
Open–closed principle
"Software entities ... should be open for extension, but closed for modification."
Liskov substitution principle
"Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program." 
Interface segregation principle
"Many client-specific interfaces are better than one general-purpose interface.
Dependency inversion principle
One should "depend upon abstractions, [not] concretions."

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