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Core Java Interview Questions and Answers

Ques 66. What is a thread?

Ans. Thread is a block of code which can execute concurrently with other threads in the JVM.

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Ques 67. What is the algorithm used in Thread scheduling?
Ans. Fixed priority scheduling.
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Ques 68. What is hash-collision in Hashtable and how it is handled in Java?
Ans. Two different keys with the same hash value. Two different entries will be kept in a single hash bucket to avoid the collision.
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Ques 69. What is the use of serializable?
Ans. To persist the state of an object into any perminant storage device.
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Ques 70. What is the use of transient?
Ans. It is an indicator to the JVM that those variables should not be persisted. It is the users responsibility to initialize the value when read back from the storage.
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