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10+ UKG Senior Software Engineer Interview Questions and Answers

Updated 10 Jan 2025

Q1. What Is Java. Who developed Java.

Ans.

Java is a high-level programming language developed by Sun Microsystems (now owned by Oracle) in 1995.

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

  • It is object-oriented and designed to have as few implementation dependencies as possible.

  • Java is widely used for building web applications, mobile apps, and enterprise software.

  • James Gosling, Mike Sheridan, and Patrick Naughton are credited with the development of Java.

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Q2. What is ApplicationContext in Spring

Ans.

ApplicationContext is an interface for providing configuration information to an application.

  • ApplicationContext is the central interface in a Spring application for providing configuration information to the application.

  • It is responsible for instantiating, configuring, and assembling beans.

  • ApplicationContext can load bean definitions, wire beans together, and dispense beans upon request.

  • It provides a means for resolving text messages, accessing resources, and loading file res...read more

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Q3. find 2nd largest number in an array

Ans.

Iterate through array to find 2nd largest number

  • Iterate through array and keep track of largest and second largest numbers

  • Handle edge cases like duplicates and empty array

  • Example: ['3', '5', '2', '7', '5'] should return 5 as the 2nd largest number

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Q4. write a prograame to find duplicate

Ans.

Program to find duplicate strings in an array

  • Iterate through the array and store each string in a HashSet

  • If a string is already in the HashSet, it is a duplicate

  • Return a list of all duplicate strings found

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Q5. tell me java8 features

Ans.

Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.

  • Lambda expressions allow you to write code in a more concise way by replacing anonymous classes.

  • Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

  • Streams provide a way to work with sequences of elements and perform operations like filter, map, reduce, etc.

  • Default methods allow interfaces to...read more

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Q6. Is JAVA platform independent

Ans.

Yes, Java is platform independent due to its ability to compile code into bytecode that can run on any platform with a Java Virtual Machine (JVM).

  • Java code is compiled into bytecode which can run on any platform with a JVM

  • JVM acts as an abstraction layer between the Java code and the underlying platform

  • Java's 'write once, run anywhere' principle allows for platform independence

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Q7. Reverse the linked list.

Ans.

Reverse a linked list by changing the direction of pointers.

  • Start with three pointers: current, previous, and next.

  • Iterate through the linked list, updating pointers to reverse the direction.

  • Return the new head of the reversed linked list.

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Q8. Internel working of Hashmap

Ans.

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

  • 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.

  • Retrieving a value involves hashing the key to find the index and then traversing the linked list ...read more

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Q9. Difference between AOT and JIT

Ans.

AOT compiles code before runtime, JIT compiles code during runtime.

  • AOT stands for Ahead Of Time compilation, compiles code before execution

  • JIT stands for Just In Time compilation, compiles code during execution

  • AOT produces machine code that can be executed directly

  • JIT converts code into machine code as needed, optimizing performance

  • Examples: AOT - Angular, JIT - Java Virtual Machine

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Q10. Swap of numbers

Ans.

Swapping two numbers without using a temporary variable.

  • Use XOR operation to swap two numbers without using a temporary variable.

  • Example: a = 5, b = 10. After swapping, a = 10, b = 5.

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Q11. explain psvm in java

Ans.

psvm in Java stands for public static void main, which is the entry point for a Java program.

  • psvm is the method signature for the main method in Java programs.

  • It is used to start the execution of a Java program.

  • It must be declared as public, static, and void.

  • It takes an array of strings as an argument, which can be used to pass command line arguments.

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Q12. explain collection

Ans.

A collection is a group of related objects or data items that are stored together.

  • Collections can be implemented using data structures like arrays, lists, sets, maps, etc.

  • Collections allow for easy manipulation and organization of data.

  • Examples of collections include arrays of integers, lists of strings, sets of unique values, and maps of key-value pairs.

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Interview Process at UKG Senior Software Engineer

based on 21 interviews
3 Interview rounds
Technical Round - 1
Technical Round - 2
Technical Round - 3
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