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Core java - Interview Questions and Answers for 'Bmc software' - 2 question(s) found - Order By Newest

 Q1. What are the different uses of Interfaces in Java ?Core Java
Ans. 1. Regulation / Enforcement / Policy / Contract , It's primary use

2. Use as a collection of utility methods(since java 8 through default methods)

3. Collecting constants together, As Interface are lighter, it makes sense to use them instead of classes if no getters and setters required.

4. Creation of Custom Annotations

5. Special services like marker interface

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 Q2. What is the difference between constructor and instance initialization blocks ?Core Java
Ans. Constructor has the same name as class name whereas instance initialization block just have a body without any name or visibility type.

instance initialization blocks are useful if we want to have some code run regardless of which constructor is used or if we want to do some instance initialization for anonymous classes.

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   Like         Discuss         Correct / Improve     instance initialization blocks  constructor  constructor vs instance initialization blocks     Asked in 2 Companies

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