Interview Questions and Answers for 'Object' | Search Interview Question

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Q91. What is composition ?

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Sample Code for composition

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Q92. What are the drawbacks of creating immutable objects ? Why don't we create all object immutable if mutability possesses so much threat ?

Core Java

Ans. Immutable objects relieves us from the problems of inconsistencies and security and helps with better read performance but at the same time are write performance and storage overheads. In case any modification is required , a new object is created and thus creating multiple copies of it.

This is the reason we use StringBuffer / StringBuilder when we have to append some text multiple times and then create a String out of it.

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Q93. Does immutability facilitates better performance ?

Core Java

Ans. Yes , but only the read performance in case we don't need to modify it much. In case we need to modify it a lot , it creates write performance overheads as we would need to create many news objects instead of just changing one.

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Q94. What is immutability and What are it's disadvantages ?

Design

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Q95. What is virtual table with respect to method overriding in Java ?

Core Java

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Q96. How is the virtual method table implemented in Java?

Core Java

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Q97. How many VTables are there for each class ?

Core Java

Ans. There is one VTable for each class.

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Q98. Have you ever used java.util.Objects class ?

Core Java

Ans. Yes, We are using requireNonNull method for validating if the object is null.

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Q99. Can a class extend itself in Java ?

Core Java

Ans. No

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Q100. How Object-Oriented Programming is implemented in JavaScript? How they differ from other languages?

Javascript

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Q101. What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. truetruetrue

c. truetruefalse

d. falsetruefalse

Ans.a. falsetruetrue

Q102. What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. falsefalsetrue

c. truetruetrue

d. falsefalsefalse

Ans.c. truetruetrue

Q103. Which of following is not the method of object class ?

Core Java

a. run

b. notify

c. wait

d. clone

Ans.a. run

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