NatWest Group Java Developer Interview Questions and Answers

Q1. Difference between hashmap and hash table
Ans. 
HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.
• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized and thread-safe.

• HashMap allows null values for both keys and values, while HashTable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while HashTable is used in mul
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Q2. Significance of equals and hashcode in java
Ans. 
Equals method is used to compare the content of objects while hashcode method is used to generate a unique integer value for an object.
• Equals method is used to compare the content of objects for equality.

• Hashcode method is used to generate a unique integer value for an object.

• Both methods are important for implementing proper object comparison and hashing in Java.
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Q1. What motivates you to come to office
Ans. 
I am motivated to come to the office by the opportunity to work on challenging projects, collaborate with talented colleagues, and contribute to the success of the team.
• Challenging projects provide a sense of accomplishment and growth

• Collaborating with talented colleagues allows for learning and innovation

• Contributing to the success of the team fosters a sense of purpose and fulfillment
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Q2. Any scenario where you coached and mentored your collegue in previous organisation?
Ans. 
Yes, I coached a junior developer on implementing design patterns in a project.
• Provided guidance on how to apply design patterns in code

• Reviewed their code and provided feedback for improvement

• Encouraged them to ask questions and seek clarification
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It was spring boot java based online round

Q1. Optional in java.
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Q2. Eager and lazy initialization in simgleton design pattern
Ans. 
Eager initialization creates the instance of Singleton class at the time of class loading, while lazy initialization creates the instance only when it is required.
• Eager initialization can lead to resource wastage if the instance is never used.

• Lazy initialization is more efficient as it only creates the instance when needed.

• Eager initialization is thread-safe by default, while lazy initialization requires synchronizatio...read more
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Discussion and analysis on Java and System Design followed by DSA which was a live coding session.