Subex Software Developer Trainee Interview Questions and Answers

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

• HashMap uses an array of buckets to store key-value pairs

• Each bucket contains a linked list of entries with the same hash code

• When a key-value pair is added, its hash code is used to determine the bucket and added to the linked list

• When a value is retrieved, its hash code is used to find the bucket and search the linked ...read more

Set methods are used to set values of private variables in a class.

• Set methods are also known as setter methods.

• They are used to ensure encapsulation in object-oriented programming.

• They typically take a parameter and set the value of a private variable to that parameter.

• For example, a set method for a class variable 'name' might look like: public void setName(String name) { this.name = name; }

Garbage collector is an automatic memory management system that frees up memory occupied by objects that are no longer in use.

• Garbage collector is a part of the runtime environment of a programming language.

• It automatically identifies and frees up memory that is no longer being used by the program.

• There are different types of garbage collectors such as mark-and-sweep, reference counting, and generational garbage collec...read more