ABSYZ Software Consulting Consultant Interview Questions and Answers

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Q1. How many types of programming languages?
Ans. 
There are three main types of programming languages: high-level, low-level, and middle-level.
• High-level languages are closer to human language and easier to understand, like Java, Python, and Ruby.

• Low-level languages are closer to machine language and harder to understand, like Assembly and Machine Code.

• Middle-level languages, like C and C++, combine elements of both high-level and low-level languages.
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Q2. There are three types of programming language. 1 - Hgh Level. 2 - Mid Level. 3 - Low Level.
Ans. 
High level languages are closer to human language, mid level languages are a mix of high and low level, and low level languages are closer to machine language.
• High level languages are easier to read and write, like Java or Python.

• Mid level languages provide a balance between high and low level, like C++.

• Low level languages are closer to machine language, like Assembly.
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Q1. What is the purpose of the final keyword in Java?
Ans. 
The final keyword in Java is used to restrict the user from changing the value of a variable, making a method not overrideable, or preventing a class from being subclassed.
• Final variables cannot be reassigned once initialized

• Final methods cannot be overridden in subclasses

• Final classes cannot be subclassed

• Final parameters in a method cannot be modified within the method
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Q2. The final keyword is used to declare constants, prevent method class inheritance.
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Q1. What is the diffrence between == and .equals() in java?
Ans. 
In Java, == compares memory addresses while .equals() compares the actual values of objects.
• == compares memory addresses of objects

• .equals() compares the actual values of objects

• Use == for comparing primitive data types

• Use .equals() for comparing objects like Strings
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Q2. == : Compares refrences (memory addresses) of objects. .equals() : Compares to content (value) of objects.
Ans. 
The '==' operator compares memory addresses of objects, while the .equals() method compares the content or value of objects.
• Use '==' for comparing memory addresses of objects.

• Use .equals() for comparing the content or value of objects.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true.
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Q1. Write a short java program to check if a number is prime.
Ans. 
Java program to check if a number is prime
• Create a function that takes an integer as input

• Check if the number is less than 2, return false

• Iterate from 2 to the square root of the number, check for divisibility

• If the number is divisible by any number, return false

• Otherwise, return true
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Q2. A prime number is a number greater than 1.....etc
Ans. 
A prime number is a number greater than 1 that can only be divided by 1 and itself.
• Prime numbers are integers greater than 1

• They have only two factors: 1 and the number itself

• Examples of prime numbers: 2, 3, 5, 7, 11, 13
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Q1. What is the difference between HashMap and ConcurrentHashMap?
Ans. 
HashMap is not thread-safe and allows null keys/values, while ConcurrentHashMap is thread-safe and does not allow null keys/values.
• HashMap is not thread-safe and can lead to ConcurrentModificationException if modified while iterating.

• ConcurrentHashMap uses internal locking mechanisms to provide thread-safety.

• ConcurrentHashMap does not allow null keys/values, while HashMap does.

• ConcurrentHashMap is more suitable for con
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Q2. HashMap is not thread-safe, but ConcurrentHashmap is thread-safe and allows concurrent access.
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Q1. How does JVM optimize method calls?
Ans. 
JVM optimizes method calls using various techniques like inlining, escape analysis, and virtual method resolution.
• JVM can inline methods by replacing the method call with the actual code, reducing overhead.

• Escape analysis helps JVM determine if objects can be allocated on the stack instead of the heap.

• Virtual method resolution optimizes method calls by caching the resolved method to avoid repeated lookups.
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Q2. JVM just Just-In-Time (JIT) compilation, method inlining, and escape analysis for optimization.
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Q1. What is Java LAnguage?
Ans. 
Java is a high-level, object-oriented programming language known for its portability and versatility.
• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)

• It is object-oriented, allowing for modular and reusable code

• Java is used for developing a wide range of applications, from web and mobile apps to enterprise systems

• Popular frameworks and libraries in Java include Spring, Hib
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Q2. Java is ha High level programming language.
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