300+ Junior Software Developer Interview Questions and Answers

The player who picks the last coin loses the game.

• The game starts with n coins.

• Each player can pick 1 to 5 coins in one turn.

• The player who picks the last coin loses the game.

• Determine if the given n coins will result in a win or loss for the starting player.

In C, 'dynamic' is not a storage class; valid ones include auto, extern, and static.

• Storage classes define the scope, visibility, and lifetime of variables.

• auto: Default storage class for local variables, e.g., 'int x;' inside a function.

• extern: Used to declare a variable that is defined in another file, e.g., 'extern int y;'.

• static: Preserves variable value between function calls, e.g., 'static int count = 0;'.

Answering questions about golang, job switch, salary expectations, and location comfort.

• Golang is a programming language developed by Google, known for its simplicity and efficiency.

• I have used golang in my previous job to develop a microservices architecture for a web application.

• I am looking to switch jobs to gain new experiences, challenges, and opportunities for growth.

• My salary expectation is based on my skills, experience, and market standards.

• I am comfortable working i...read more

b) x is four bit integer.

• The statement 'int x:4;' indicates that x is a four bit integer.

• A four bit integer can have values ranging from 0 to 15.

• The colon followed by the number 4 specifies the number of bits allocated for x.

Deadlock is a situation where two or more processes are unable to proceed because they are waiting for each other to release resources.

• Deadlock occurs when two or more processes are blocked and unable to proceed.

• It happens when each process is holding a resource and waiting for another resource to be released.

• There are four necessary conditions for deadlock: mutual exclusion, hold and wait, no preemption, and circular wait.

• Examples of resources that can cause deadlock include...read more

Reverse a linked list using recursion, handling all corner cases

• Create a recursive function that takes the head of the linked list as input

• Base case: if the head is null or the list contains only one node, return the head

• Recursively call the function with the next node as input and set its next pointer to the current node

• Set the current node's next pointer to null and return the new head

Questions related to Java programming language concepts and SQL queries.

• final is a keyword used to declare a constant value, finally is a block of code that executes after a try-catch block

• static final is used to declare a constant value that can be accessed without creating an instance of the class, local variable has a limited scope within a method

• Deadlock occurs when two or more threads are blocked and waiting for each other to release resources, prevention can be done by ...read more

Yes, we can use super and this in a single constructor.

• Using 'super' in a constructor calls the parent class constructor.

• Using 'this' in a constructor calls another constructor in the same class.

• We can use both 'super' and 'this' in the same constructor to call both parent and same class constructors.

• Example: public MyClass(int x) { this(x, 0); super(); }

Interfaces define a contract for classes to implement, while abstract classes can have both abstract and concrete methods.

• Interfaces can only have abstract methods and constants, while abstract classes can have both abstract and concrete methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used for achieving multiple inheritance in Java, while abstract classes are used to define a common behavior for subclasses.

• Interfac...read more

Yes, protected members are inherited in subclasses in hierarchy.

• Protected members are accessible within the class and its subclasses.

• They are not accessible outside the class hierarchy.

• Subclasses can access protected members of their parent class.

• Example: class A has a protected member x, class B extends A can access x.

• Example: class C extends B can also access x.

Write a function to check whether a binary tree is a sub-tree of another binary tree (Check for all corner cases)

• Create a function that traverses both trees and compares them

• Check if the root of the second tree matches any node in the first tree

• Handle cases where one or both trees are empty

• Handle cases where the trees have different structures

Function to add two numbers represented by linked lists and return the sum list.

• Traverse both linked lists and add corresponding nodes, keeping track of carry

• Create a new linked list to store the sum

• Handle cases where linked lists are of different lengths

• Handle cases where the sum has an extra digit due to carry

• Return the sum linked list

The super class of Exception is Throwable.

• Throwable is the root class of all exceptions in Java.

• It has two direct subclasses: Exception and Error.

• Exceptions are used for recoverable errors while Errors are used for unrecoverable errors.

• All exceptions and errors inherit from Throwable.

• Throwable provides methods like getMessage() and printStackTrace() to handle exceptions.

Constructor creates and initializes an object, while method performs an action on an object.

• Constructor has the same name as the class and is called when an object is created

• Method has a name that describes the action it performs on an object

• Constructor initializes the object's state, while method changes the object's state

• Constructor doesn't have a return type, while method can have a return type

• Example: public class Car { public Car() { ... } public void start() { ... } }

• In...read more

A stored procedure is a precompiled set of SQL statements that can be called by name, while a function returns a value.

• Stored procedures are used to perform a specific task, such as inserting or updating data in a database.

• Functions return a value, while stored procedures do not necessarily return a value.

• Stored procedures can be called from within other SQL statements, while functions cannot.

• Stored procedures can have input and output parameters, while functions can only hav...read more

Data structures are essential for efficient storage and retrieval of data.

• Data structures allow for faster access and manipulation of data.

• They help in organizing and managing large amounts of data.

• Examples include arrays, linked lists, trees, and graphs.

• Without data structures, algorithms would be less efficient and more complex.

• Data structures are used in various fields such as computer science, finance, and engineering.

Count the number of 0's in a sorted array of 0's and 1's.

• Iterative solution: Traverse the array and count the number of 0's.

• Recursive solution: Divide the array into two halves and recursively count the number of 0's in each half.

• Binary search can also be used to find the first occurrence of 0 and then count the number of 0's after that index.

Java, Python, PHP, DBMS, and .NET are all programming languages or technologies used in software development.

• Java is an object-oriented programming language used for developing desktop, web, and mobile applications.

• Python is a high-level programming language used for web development, data analysis, artificial intelligence, and scientific computing.

• PHP is a server-side scripting language used for web development and creating dynamic web pages.

• DBMS stands for Database Managemen...read more

Binary Search Tree is a data structure where each node has at most two children, with left child smaller and right child larger. Time complexity is O(log n) for search, insert, and delete operations.

• Nodes have at most two children - left child is smaller, right child is larger

• Search, insert, and delete operations have time complexity of O(log n)

• Example: In a BST, if we search for a value, we can eliminate half of the remaining nodes at each step

Array is a fixed-size data structure while linked list is a dynamic data structure. ArrayList and LinkedList are implementations of List interface in Java.

• Array is a contiguous block of memory with fixed size, while linked list is a collection of nodes where each node points to the next node.

• ArrayList in Java is implemented using an array, which can dynamically resize itself. LinkedList is implemented using nodes with references to the next and previous nodes.

• Arrays are faste...read more

SQL joins are used to combine data from two or more tables based on a related column between them.

• Inner join returns only the matching rows from both tables

• Left join returns all rows from the left table and matching rows from the right table

• Right join returns all rows from the right table and matching rows from the left table

• Full outer join returns all rows from both tables

• Cross join returns the Cartesian product of both tables

Java is a high-level, object-oriented programming language used for developing applications and software.

• Java was developed by James Gosling at Sun Microsystems in the mid-1990s.

• It was originally called Oak and was designed for use in consumer electronics.

• Java syntax is similar to C++ and C#.

• Java code is compiled into bytecode that can run on any platform with a Java Virtual Machine (JVM).

A list of technical questions for a Junior Software Developer position.

• Super is a keyword in Java used to refer to the parent class.

• Java is platform independent due to its bytecode being able to run on any platform with a JVM.

• Multiple Inheritance is the ability for a class to inherit from multiple parent classes.

• The diamond problem occurs when a class inherits from two classes that have a common ancestor, causing ambiguity.

• Normalization is the process of organizing data in a ...read more

JOIN is used in MySQL to combine data from two or more tables based on a related column between them.

• JOIN is used to retrieve data from multiple tables in a single query

• It is used to combine rows from two or more tables based on a related column between them

• Types of JOIN include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN

• Example: SELECT * FROM table1 JOIN table2 ON table1.column = table2.column

Programming language is a set of instructions used to communicate with computers. To become a good programmer, one needs to practice and learn continuously.

• Choose a language and stick to it

• Practice coding regularly

• Read and understand code written by others

• Learn data structures and algorithms

• Stay updated with new technologies and trends

A Controller handles web requests, while a Rest Controller specifically manages RESTful web services.

• A Controller typically returns views (HTML) for web applications.

• A Rest Controller returns data (JSON/XML) for APIs.

• Example of Controller: @Controller in Spring MVC.

• Example of Rest Controller: @RestController in Spring Boot.

• Rest Controllers are stateless and focus on resource representation.