Rakuten Software Developer Interview Questions and Answers

Merge two sorted arrays into one sorted array in place.

• Iterate from the end of both arrays and compare elements to merge in place

• Use two pointers to keep track of the current position in each array

• Handle cases where one array is fully merged before the other

Reverse a stack using recursion without using any extra space other than the internal stack space.

• Use recursion to pop all elements from the original stack and store them in function call stack

• Once the stack is empty, push the elements back in reverse order using recursion

• Make use of auxiliary functions to handle the recursion process

Objects in JVM memory are created on the heap and managed by the garbage collector.

• Objects are created on the heap memory in JVM.

• Memory for objects is allocated using the 'new' keyword.

• Objects are managed by the garbage collector to reclaim unused memory.

• Garbage collector uses different algorithms like Mark-Sweep, G1, etc.

• Example: 'String str = new String("Hello World");'

Method overriding in Java allows a subclass to provide a specific implementation of a method that is already provided by its superclass.

• In method overriding, a subclass provides a specific implementation of a method that is already provided by its superclass.

• The method in the subclass must have the same name, return type, and parameters as the method in the superclass.

• Method overriding is used to achieve runtime polymorphism in Java.

• Example: class Animal { void sound() { Syst...read more

JVM stands for Java Virtual Machine, which is a virtual machine that enables a computer to run Java programs.

• JVM is an abstract computing machine that enables a computer to run Java programs.

• It provides a runtime environment in which Java bytecode can be executed.

• JVM is platform-independent, meaning Java code can run on any device that has a JVM installed.

• It manages memory, provides security, and facilitates garbage collection.

• Examples of JVM implementations include Oracle Ho...read more