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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
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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
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Ans. No, results in exception.

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   Like      Discuss      Correct / Improve     java   collections   treemap     Visa  Prokarma  Sabre  Polaris  Deloitte  Cognizant (CTS)      Basic        frequent


 Q3. How can we destroy an object ? Core Java2017-05-07 20:39:20

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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   Like      Discuss      Correct / Improve     Garbage collection  object destruction     Sabre


 Q4. When does an object cleaned or destroyed by garbage collection ?Core Java2017-05-07 20:41:46

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

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   Like      Discuss      Correct / Improve     garbage collection  object destruction     Sabre




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