Xyz Company Software Engineer Interview Questions, Process, and Tips

During the coding test, I was asked to write a program to check the frequency of characters in a string.

Q1. What is Java , what are the four pillars of java
Ans. 
Java is a popular programming language known for its platform independence and object-oriented approach.
• Java is platform-independent, meaning it can run on any device with a Java Virtual Machine (JVM)

• Object-oriented programming is a key feature of Java, allowing for code reusability and modularity

• The four pillars of Java are: Inheritance, Encapsulation, Abstraction, and Polymorphism

• Inheritance allows a class to inherit...read more
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Q2. Related to collection framework
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Q3. What is recursion, write a code for it
Ans. 
Recursion is a programming technique where a function calls itself to solve a problem.
• Recursion involves breaking down a problem into smaller subproblems and solving them recursively.

• A base case is needed to stop the recursion and prevent infinite loops.

• Example: Factorial calculation using recursion - function factorial(n) { return n === 0 ? 1 : n * factorial(n-1); }
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Q4. Why we don't use pointers in java
Ans. 
Java doesn't use pointers for security and simplicity reasons.
• Java uses references instead of pointers to avoid direct memory manipulation.

• Pointers can lead to memory leaks and security vulnerabilities.

• Java's garbage collection manages memory automatically, reducing the need for pointers.
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Q5. What are the difference between array and arraylist
Ans. 
Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.
• Array is a fixed-size collection of elements of the same data type, while ArrayList is a dynamic-size collection that can grow or shrink.

• Arrays can store primitive data types and objects, while ArrayList can only store objects.

• Arrays require a specified size at the time of declaration, while ArrayList can dynamically resize it...read more
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Reverse a string using functional programming java

Springboot implementation crud operation for airline booking

Math , reasoning , nothing else h .h

Arrays arrange, string range h j

SQL , Logical, Verbal

Q1. What is IP Address?
Ans. 
An IP address is a unique numerical label assigned to each device connected to a computer network.
• IP addresses are used to identify and locate devices on a network.

• There are two types of IP addresses: IPv4 and IPv6.

• IPv4 addresses are written as four sets of numbers separated by periods (e.g. 192.168.1.1).

• IPv6 addresses are written as eight groups of four hexadecimal digits separated by colons (e.g. 2001:0db8:85a3:0000:
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Q1. Tell me about yourself?
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