Interview Questions and Answers for 'Opencrowd' | Search Interview Question

Interview Questions and Answers for 'Opencrowd' - 2 question(s) found - Order By Rating

Usually asked with Questions related to Generics.

Q1. What are Type Erasures in Java ?

Ans. Type erasure applies to the use of generics. When generics are used, they're pre compiled into compile time checks and execution-time casts.

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What are concepts introduced with Java 5 ?

Is this a valid initialization ? Explain.

Collection<Collection> collection = new LinkedList<LinkedList>();

Which of the following syntax is correct ?import static java.lang.System.*;or static import java.lang.System.*;

Is it legal to initialize List like this ?

Which of the following syntax are correct ?a. LinkedList<Integer> l=new LinkedList<int>();b. List<Integer> l=new LinkedList<int>();c. LinkedList<Integer> l=new LinkedList<Integer>();d. List<Integer> l = new LinkedList<Integer>();

Which of the following was not introduced with Java 5 ?

Explain Generics in Java ?

In case of generic class declared like following , What can T hold

class MyClass<T>{
T element;
}

Can we use generics with arrays in Java ?

Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions.

Q2. What is rule regarding overriding equals and hashCode method ?

Core Java

Ans. A Class must override the hashCode method if its overriding the equals method.

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Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?

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