NatWest Group Interview Questions, Process, and Tips

Q1. What is the Java stream
Ans. 
Java Stream is a sequence of elements that supports functional-style operations.
• Java Stream is used to process collections of objects in a functional way.

• It allows for operations like filter, map, reduce, and collect to be performed on the elements.

• Streams can be sequential or parallel, providing better performance for large datasets.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); Stream stream = names.
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Q2. What is the regression test?
Ans. 
Regression testing is the process of re-running previously executed tests to ensure that new code changes have not adversely affected existing functionality.
• Regression testing is performed to verify that new code changes have not introduced any new bugs or issues.

• It involves re-running previously executed test cases to ensure that existing functionality still works as expected.

• Regression testing is typically automated ...read more
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Q1. What is static keyword
Ans. 
Static keyword is used in programming languages to declare variables, methods, or classes that belong to the class itself rather than instances of the class.
• Static variables are shared among all instances of a class.

• Static methods can be called without creating an instance of the class.

• Static classes cannot be instantiated and are used for grouping related methods and variables.

• In Java, static keyword is used to create...read more
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Q2. Explain about framework
Ans. 
A framework is a structured set of guidelines, libraries, and tools used to develop and maintain software applications.
• Framework provides a foundation for building software applications

• It includes reusable code libraries, tools, and best practices

• Frameworks help in organizing code, improving efficiency, and promoting consistency

• Examples: Selenium for web automation testing, TestNG for test management in Java
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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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Q1. Basic mcq's related to Java,spring Boot
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Q1. Importance of Equals and hashcode
Ans. 
Equals and hashcode are important for object comparison and hashing in Java.
• Equals method is used to compare two objects for equality.

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

• Equals and hashcode are used in collections like HashMap and HashSet for efficient retrieval and storage.
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Q2. Difference between comparable and comparator
Ans. 
Comparable is an interface used for natural ordering, while Comparator is an interface used for custom ordering.
• Comparable is implemented by the class itself to define the natural ordering of objects.

• Comparator is implemented by a separate class to define custom ordering of objects.

• Comparable uses the compareTo() method to compare objects, while Comparator uses the compare() method.

• Example: String class implements Comp...read more
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Q3. Write code for Singelton design pattern
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance of the class

• Provide a public static method to access the instance

• Ensure the constructor is private to prevent instantiation
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Q4. Difference b/w hashmap and hashtable
Ans. 
HashMap is non-synchronized and allows null values, while Hashtable is synchronized and does not allow null keys or values.
• HashMap is non-synchronized, while Hashtable is synchronized

• HashMap allows null values, while Hashtable does not allow null keys or values

• HashMap is faster than Hashtable

• HashMap is part of the Java Collections Framework, while Hashtable is a legacy class
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Q1. How do you resolve conflicts within the team
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Q2. What went well in you last company? What didn't go well?
Ans. 
At my last company, effective communication and collaboration among team members went well, but there were challenges with project timelines and resource allocation.
• Effective communication and collaboration among team members

• Challenges with project timelines

• Challenges with resource allocation
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