QBurst Technologies Senior Java Developer Interview Questions, Process, and Tips

Stream API in Java provides a functional approach to processing collections of objects.

• Allows for concise and readable code by using functional programming concepts like map, filter, and reduce.

• Enables parallel processing of data, improving performance for large datasets.

• Supports lazy evaluation, allowing for efficient use of resources.

• Example: List names = Arrays.asList("Alice", "Bob", "Charlie"); names.stream().filte...read more

Java code to filter even numbers from a list and store the square of those in another list

• Create two ArrayLists to store the original list and the squared even numbers list

• Iterate through the original list and check if each number is even

• If the number is even, square it and add it to the squared even numbers list

Java code to check if two strings are anagrams

• Create a function that takes in two strings as parameters

• Convert both strings to char arrays and sort them

• Compare the sorted char arrays to check if they are equal

Functional interfaces in Java are needed to enable the use of lambda expressions, which provide a concise way to implement single abstract method interfaces.

• Functional interfaces have exactly one abstract method and can have multiple default or static methods.

• They are used to enable the use of lambda expressions, which provide a concise way to implement the single abstract method.

• Examples of functional interfaces in Ja...read more

Threads in Java can be created by extending the Thread class or implementing the Runnable interface.

• Extend the Thread class and override the run() method

• Implement the Runnable interface and implement the run() method

• Use the Executor framework for managing threads