Core java - Interview Questions and Answers for 'Sabre' | Search Interview Question

Core java - Interview Questions and Answers for 'Sabre' - 4 question(s) found - Order By Newest

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.

Q1. 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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Q2. Can we have null keys in TreeMap ?

Core Java

Ans. No, results in exception.

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Q3. How can we destroy an object ?

Core Java

Ans. We cannot explicitly initiate destruction of an object as no destroy method is available in java. Only Garbage collection can destroy an object.

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Q4. When does an object cleaned or destroyed by garbage collection ?

Core Java

Ans. When it is no longer referenced or it looses all references which were earlier pointing to it.

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