Peel-works Java Developer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Easy

The second round is also written but you need to write programming based on their concept.

Q1. 
Prime Numbers Identification
Given a positive integer N, your task is to identify all prime numbers less than or equal to N.
Explanation:
A prime number is a natural number greater than 1 that has no po...read more
Ans. 
Identify all prime numbers less than or equal to a given positive integer N.
• Iterate from 2 to N and check if each number is prime

• Use the Sieve of Eratosthenes algorithm for better efficiency

• Optimize by only checking up to the square root of N for divisors
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Q2. 
Palindrome String Validation
Determine if a given string 'S' is a palindrome, considering only alphanumeric characters and ignoring spaces and symbols.
Note:
The string 'S' should be evaluated in a case...read more
Ans. 
Check if a given string is a palindrome after removing special characters, spaces, and converting to lowercase.
• Remove special characters and spaces from the string

• Convert the string to lowercase

• Check if the modified string is a palindrome by comparing characters from start and end
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions mainly on Java and OOPS concepts.

Q1. What is the difference between static methods and instance methods in Java?
Ans. 
Static methods belong to the class itself, while instance methods belong to individual objects of the class.
• Static methods are called using the class name, while instance methods are called using object references.

• Static methods cannot access instance variables directly, while instance methods can access both static and instance variables.

• Static methods are shared among all instances of the class, while instance method...read more
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Q2. What is the difference between an abstract class and an interface in Java?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, member variables, and methods with implementation.

• Interface can only have abstract methods and constants.

• A class can implement multiple interfaces but can only extend one abstract class.

• Example: Abstract class - Animal with abstract method 'eat', Interface - Flyable with m...read more
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Q3. What is the difference between ClassNotFoundException and NoClassDefFoundError in Java?
Ans. 
ClassNotFoundException occurs when a class is not found during runtime, while NoClassDefFoundError occurs when a class was found during compilation but not during runtime.
• ClassNotFoundException is a checked exception, while NoClassDefFoundError is an Error.

• ClassNotFoundException occurs when a class is not found at runtime, usually due to a missing classpath or incorrect class name.

• NoClassDefFoundError occurs when a cla...read more
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Q4. What is the difference between an Error and an Exception in Java?
Ans. 
Error is a serious issue that cannot be handled at runtime, while Exception is a recoverable issue that can be caught and handled.
• Error is a subclass of Throwable and is usually caused by the environment or system, such as running out of memory or stack overflow.

• Exception is also a subclass of Throwable but is caused by the application code, such as invalid input or file not found.

• Errors are unchecked and are not meant...read more
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Q5. What is SerialVersionUID in Java?
Ans. 
SerialVersionUID is a unique identifier used by Java to ensure the compatibility of serialized objects.
• SerialVersionUID is a static final long variable in a class that implements Serializable interface.

• It is used to ensure that the serialized object can be deserialized correctly even if the class definition has changed.

• If the SerialVersionUID of the serialized object does not match the one in the class, an InvalidClass...read more
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Q6. What are the requirements for creating an immutable class in Java?
Ans. 
Requirements for creating an immutable class in Java
• Make the class final so it cannot be extended

• Make all fields private and final

• Do not provide setter methods, only getter methods

• Ensure that mutable objects are not returned in getter methods

• Override equals() and hashCode() methods for proper comparison

• Consider making defensive copies of mutable fields in constructor or getter methods
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Basics questions of logical reasoning , english , mathematics etc

Q1. How to check current version of java coding question reverse a string project explaniation that you mention in your resume. interfaces?
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Q2. Encapsulation vs abstraction
Ans. 
Encapsulation is hiding implementation details while abstraction is hiding unnecessary details.
• Encapsulation is achieved through access modifiers like private, protected, and public.

• Abstraction is achieved through abstract classes and interfaces.

• Encapsulation protects the data from external interference while abstraction focuses on the essential features.

• Example of encapsulation: hiding the implementation details of a ...read more
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Q3. Jvm vs jre vs jdk
Ans. 
JVM is a virtual machine that executes Java bytecode. JRE is a runtime environment that includes JVM and libraries. JDK is a development kit that includes JRE and tools for developing Java applications.
• JVM stands for Java Virtual Machine and is responsible for executing Java bytecode.

• JRE stands for Java Runtime Environment and includes JVM and libraries required to run Java applications.

• JDK stands for Java Development ...read more
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Q1. Explain basics of c#
Ans. 
C# is a programming language developed by Microsoft for building a wide range of applications on the .NET framework.
• C# is an object-oriented language with features like classes, inheritance, and polymorphism.

• It is strongly typed, meaning variables must be declared with a specific data type.

• C# supports modern programming concepts like async/await for asynchronous programming.

• It is commonly used for developing desktop, w...read more
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Q2. C# basics oops sql server
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Q1. What you do? Description with analysis
Ans. 
I am a Java Developer responsible for designing, developing, and maintaining Java applications.
• Design and develop Java applications

• Write clean, efficient, and maintainable code

• Collaborate with team members to troubleshoot and solve technical issues
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Q1. Java,sql,python
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Q1. What is your goal
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It was deciphering spoken language to subtitle for a complicated accented show

Q1. Why do you want to work here?
Ans. 
I am passionate about the company's mission and values, and I believe my skills and experience align well with the opportunities here.
• Passionate about company's mission and values

• Skills and experience align well with opportunities

• Excited about potential for growth and development
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Q2. What are you passionate about that made you apply for this job?
Ans. 
I am passionate about using data analysis to drive business decisions and improve processes.
• I have always been fascinated by the power of data to uncover insights and drive strategic decision-making.

• I enjoy working with large datasets and using statistical tools to extract meaningful information.

• I believe that data-driven decision-making is crucial for businesses to stay competitive in today's market.

• For example, in my...read more
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Q1. Oops? .net core features
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