Techouts Software Engineer Trainee Interview Questions and Answers

They gave us 2 coding questions, must code in java, they personally checked each of our codes, 1 hr duration (They may extend for around 30 mins), should have java installed on our systems prior.

Q1. Difference between array list, array in java
Ans. 
Array list is a dynamic array that can grow or shrink in size, while array in Java is a fixed-size collection of elements.
• Array list in Java is a class that implements List interface and allows dynamic resizing.

• Arrays in Java are fixed in size and cannot be resized once initialized.

• Example: ArrayList<String> arrayList = new ArrayList<String>(); String[] array = new String[5];
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Q2. About spring boot
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Q3. Write code for dynamic arrays
Ans. 
Code snippet to implement dynamic arrays with add, remove, and access methods.
• Use a list or vector data structure to implement dynamic arrays.

• For adding elements, use the append or push_back method.

• For removing elements, use the erase or remove method.

• For accessing elements, use the index operator or at method.
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Q4. For loop, for each
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Q5. What do u know about java
Ans. 
Java is a popular programming language known for its platform independence and object-oriented approach.
• Java is an object-oriented programming language

• It is known for its platform independence, meaning Java programs can run on any device that has a Java Virtual Machine (JVM)

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

• Java has a rich set of libraries and frameworks tha...read more
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Q6. Oops concepts
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Q7. Introduce urself
Ans. 
I am a recent graduate with a degree in Computer Science, passionate about coding and problem-solving.
• Recent graduate in Computer Science

• Passionate about coding and problem-solving
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Q8. Linked list - node insertion, deletion in java
Ans. 
Linked lists allow dynamic data structure manipulation with efficient node insertion and deletion operations.
• A linked list consists of nodes, where each node contains data and a reference to the next node.

• Insertion can be done at the head, tail, or any specific position in the list.

• Example of insertion at the head: Create a new node and set its next to the current head, then update the head.

• Deletion involves removing a...read more
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Q9. Heaps in java, how does internal memory allocation happen for heaps
Ans. 
In Java, heaps are used for dynamic memory allocation. Internal memory allocation in heaps is managed by the JVM.
• Heaps in Java are used for storing objects and dynamically allocated memory.

• Memory allocation in heaps is managed by the Java Virtual Machine (JVM).

• The JVM uses a technique called garbage collection to reclaim memory from objects that are no longer in use.

• Objects in the heap are allocated memory based on the...read more
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Q1. Introduce yourself
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Q2. What is a Java
Ans. 
Java is a high-level programming language known for its portability, security, and versatility.
• Java is an object-oriented language

• It is platform-independent, meaning code can run on any device with a Java Virtual Machine (JVM)

• Java is used for developing a wide range of applications, from mobile apps to enterprise systems
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Duration: 30 minutes