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Q1081. How would you design a Thread Pool ?

Design

Ans. By using Executor Framework , we can create Thread pool

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Q1082. Write Java code that would cause deadlock ?

Core Java

Ans. https://howtodoinjava.com/java/multi-threading/writing-a-deadlock-and-resolving-in-java/

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Q1083. How Bitly shortens the URL ?

Web

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Q1084. Design database schema for Facebook like application.

Database

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Q1085. how is the internal code for the "volatile" implemented ?

Core Java

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Q1086. Difference between sleep() and Wait()

Operating System

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Q1087. Can methods without a return type be declared in Java? Is there a difference between void return type and no return type ?

Core Java

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Q1088. What is the default execution method in Java?

Core Java

Ans. public static void main(String[] args)

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Q1089. What will happen if there is an exception in Java finally block ?

Core Java

Ans. The regular behavior of exception handling will occur. It will look for any immediate catch handler and if none is provided, it would be transmitted to the callers until a catch handler is found or it's out of main function.

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Q1090. Can you explain any of your project bug for which you had to struggle a lot ?

General

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Q1091. What is immutability and What are it's disadvantages ?

Design

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Q1092. What are the disadvantages of Design Patterns ?

Design Pattern

Ans. 1. Design patterns are abstraction heavy and hence sometimes creates memory and performance overheads.

2. Sometimes they create unnecessary complexity without much added advantage.

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Q1093. Design a Whats app like messaging application.

architecture

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Q1094. Given a String with letters , numbers and special characters , extract Tokens from it. The rules for Token extraction are ac follows

1. Should for token of all characters till a number or special character is found
2. Should form token of all numbers till a character or special character is found
3. Special character in itself is a token
4. Ignore white spaces

For example - Bob Said "He is here"

should result in

Bob A
Said A
" S
He A
is A
here A
" S

where a is specifying alphabet and S as special character

Design

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Q1095. Difference between final and finally

Core Java

Ans. final can be used for variables , methods and class. A final variable cannot be changed , a final method cannot be overridden , a final class cannot be inherited.

Finally is a block which is used after Try and catch, a finally block is always executed.

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Q1096. What is setter injection ?

Spring

Ans. Setter Injection in Spring is a type of dependency injection in which the framework injects the dependent objects into the client using a setter method.

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Q1097. Tell something about Dependency Injection and it's drawbacks. In which situation, you may not like to use dependency injection ?

Design

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Q1098. Design a Program to clone an object and all it's children.

Design

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Q1099. What is the difference between dynamic programming and the brute force algorithm?

Algorithm

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Q1100. Why does an array need continuous memory locations and not Linked List ?

Data Structure

Ans. Array needs continuous memory location because it need to provide random access of it's elements which is not required for Linked List.

Array index acts as an offset from the base address and hence can retrieve the respective element using the expression Base Address + ( Index * Element Size ). This expression could only hold true if the elements are in continuous memory location.

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Q1101. Why does an array index starts at 0 and not 1 ?

Data Structure

Ans. The array index starts with 0 because program locates an element using the expression ( BaseAddress + ( Index * size of array Element ), where index is used as an offset. As the starting address is actually the address of first element, the index of first element is used as 0 and so on.

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Q1102. How will you implement your own custom hashmap and linkedlist ?

Data Structure

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Q1103. Tell about shallow and deep cloning ?

Core Java

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Q1104. In Case of multi layered application, If DAO layer throws an exception , How will you handle it upstream ?

Design

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Q1105. What is optimistic and pessimistic locking ?

Operating System

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Q1106. Difference between 32 bit and 64 bit JVM ?

Core Java

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Q1107. How do we do Inheritance in Java ?

Core Java

Ans. By extending class or implementing interface.

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Q1108. What is Dynamic Binding ?

Core Java

Ans. Dynamic Binding happens at runtime. Method overriding is an example of Dynamic Binding

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Q1109. Have you faced any problem integrating software / services with any of your partners or vendors ?

General

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Q1110. What development process / methodology are you using ? Are you using agile ?

General

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