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Q:

How does a try statement determine which catch clause should be used to handle an exception?

Answer

When an exception is thrown , the catch block of the try statement are examined in the order in which they appear. The first catch block that is capable of handling the exception is executed. The remaining catch blocks are ignored

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Subject: Java

Q:

What is static initializer block? What is its use?

Answer

A static initializer block is a block of code that declares with the static keyword. It normally contains the block of code that must execute at the time of class loading. The static initializer block will execute only once at the time of loading the class only.

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Subject: Java

Q:

What are the restrictions when overriding a method ?

Answer

Overridden methods must have the same name, argument list, and return type (i.e., they must have the exact signature of the method we are going to override, including return type.)


The overriding method cannot be less visible than the method it overrides( i.e., a public method cannot be override to private).


The overriding method may not throw any exceptions that may not be thrown by the overridden method

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Subject: Java

Q:

What is inheritance?

Answer

Inheritance is the ability to create new classes based on existing classes. It is useful to reuse existing code.

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Subject: Java
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Q:

What is encapsulation?

Answer

Encapsulation describes the ability of an object to hide its data and methods from the rest of the world 

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Subject: Java

Q:

What is the security mechanism used in java?

Answer

Java uses sand box security model.

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Subject: Java

Q:

What is diamond problem?

Answer

The diamond problem is an ambiguity that can occur when a class multiply inherits from two classes that both descend from a common super class

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Subject: Java

Q:

What is the difference between array and ArrayList ?

Answer

Array is collection of same data type. Array size is fixed, It cannot be expanded.


 


But ArrayList is a growable collection of objects.ArrayList is a part of Collections Framework and can work with only objects.

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Subject: Java