HEPL - A Cavinkare Group Company Senior Java Developer Interview Questions and Answers

Q1. Program on sorting
Ans. 
Sorting program to arrange strings in alphabetical order
• Use Arrays.sort() method to sort the array of strings

• Implement a custom Comparator to sort in a specific order

• Consider using Collections.sort() for sorting ArrayList of strings
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Q1. Multi-threading
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Q1. Basic Java Question?
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Q2. Related oops concept
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Q1. Deep in Collections, Java 8 features, Arrays, Exceptions
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Q1. How do you explain a C student to use Java
Ans. 
Explain the basics of Java in a simple and practical way, focusing on hands-on examples and real-world applications.
• Start by explaining the basic syntax and structure of Java code

• Use simple examples to demonstrate concepts like variables, loops, and functions

• Show how Java is used in real-world applications, such as building websites or mobile apps
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Q2. What is memory management
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Memory management is the process of controlling and coordinating computer memory, assigning portions called blocks to various running programs.
• Memory allocation - assigning memory blocks to programs as needed

• Memory deallocation - releasing memory blocks when no longer needed

• Memory fragmentation - the division of memory into small blocks leading to inefficient use

• Memory leaks - when a program fails to release memory aft...read more
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Q1. Core java, stream api, spring boot, junit, spring core,jpa , hibernate
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Q1. Java,spring boot
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Q1. What is hashmap
Ans. 
HashMap is a data structure in Java that stores key-value pairs and allows fast retrieval of values based on keys.
• HashMap implements the Map interface in Java

• It allows null keys and values

• Keys in a HashMap must be unique

• Example: HashMap<String, Integer> map = new HashMap<>()
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Q2. Internal Working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of keys to calc...read more
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Q3. Compare Throw vs Throws
Ans. 
Throw is used to explicitly throw an exception in a method, while Throws is used to declare the exceptions that a method may throw.
• Throw is used within a method to throw an exception explicitly.

• Throws is used in the method signature to declare the exceptions that the method may throw.

• Throw is followed by an instance of Throwable class, while Throws is followed by the exception class names separated by commas.

• Example: t...read more
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Q4. Array vs Arraylist
Ans. 
Arrays are fixed in size, while ArrayLists can dynamically resize. ArrayLists provide more flexibility and functionality.
• Arrays have a fixed size, while ArrayLists can dynamically resize.

• ArrayLists can easily add, remove, or modify elements, while arrays require manual shifting of elements.

• Arrays use [] syntax for declaration and initialization, while ArrayLists use the ArrayList class from the Java Collections framewo
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Q5. Arraylist vs LinkedList/Vector
Ans. 
ArrayList is resizable array implementation, LinkedList is doubly linked list implementation, Vector is synchronized version of ArrayList.
• ArrayList is faster for accessing elements, LinkedList is faster for adding/removing elements in middle.

• ArrayList uses less memory than LinkedList due to contiguous memory allocation.

• Vector is thread-safe but slower than ArrayList due to synchronization overhead.
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Q6. Write a code for Iterate hashmap using iterator
Ans. 
Iterate through a hashmap using an iterator in Java
• Create an iterator using the entrySet() method of the hashmap

• Use a while loop to iterate through the hashmap entries

• Access the key and value of each entry using the getKey() and getValue() methods
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Q1. Java & advance java,spring Boot
Ans. 
I m to get yourlife company to work.
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Q2. Check my skills
Ans. 
It's like technical round & Hr round , way of language speaking.
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Q3. I ability to doing work hard in this company
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Q4. I'm have read to extra work form this company
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Q5. I hope I think about me good everything it's OK thank you my side.
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Aptitude test with Java MCQ questions

Basic programs in Java

Q1. Salary discussion
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