Fullstack Java Application Developer Interview Questions and Answers for Freshers

Singleton class is a class that can only have one instance and provides a global point of access to it.

• Singleton class restricts the instantiation of a class to one object.

• It provides a way to access its unique instance globally.

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or thread pools.

Java is a versatile programming language used for developing a wide range of applications, from web and mobile apps to enterprise systems.

• Java is used for developing web applications, mobile applications, desktop applications, and enterprise systems.

• It is commonly used in backend development for server-side programming.

• Java is also used in game development, scientific applications, and big data processing.

• It is platform-independent, meaning Java programs can run on any device...read more

The task is to find all pairs in an array that add up to a given sum.

• Iterate through the array and store each element in a hash set.

• For each element, check if the difference between the sum and the element exists in the hash set.

• If it does, add the pair to the result list.

To add a dependency, you need to specify it in the project's build file.

• Open the build file (pom.xml for Maven or build.gradle for Gradle)

• Add the dependency in the appropriate section

• Save the file and run the build command to download and install the dependency

• Example: com.example example-library 1.0.0