Epps Infotech Interview Questions and Answers

30 mcq questions based on Core Java ,Spring annotation ,Spring MVC and Servelet,Hibernate

Q1. Core Java questions,Hibernate Mappings ,collections questions,Logical basic questions
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Q2. Hashmap Put and retrive element
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Q3. How to compare objects in java
Ans. 
Objects in Java can be compared using the equals() method or by implementing the Comparable interface.
• Use the equals() method to compare objects for equality.

• Implement the Comparable interface and override the compareTo() method to define custom comparison logic.

• For comparing custom objects, override the equals() and hashCode() methods for proper comparison.
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Q4. Annotations in Hibernate
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Annotations in Hibernate are used to provide metadata about the entity class and its properties.
• Annotations are used to map Java classes to database tables and properties to columns.

• Annotations reduce the need for XML configuration files in Hibernate.

• Examples of annotations in Hibernate include @Entity, @Table, @Column, @Id, @GeneratedValue, etc.
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Q5. How Hashmap works internally
Ans. 
HashMap in Java uses hashing to store key-value pairs and provides constant-time performance for basic operations.
• HashMap uses an array of buckets to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple keys hash to the same index (collision), a linked list or balanced tree is used to store multiple entries at that index.

• Ha...read more
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Develop a web page using React and develop the required routes using nestjs.

Q1. Technical questions related to the project.
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Q1. Basic Of SQL , Views
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Q1. DDL, DML Commands , Query Solving
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