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Mahesh Parahar has Published 191 Articles

Mahesh Parahar
1K+ Views
In Java, as we know, Collections are one of the most important concepts that make Java a powerful language in itself. It's the support of collections in Java that makes it support any type of data in a convenient and efficient way, along with possible CRUD operations over them. But ... Read More

Mahesh Parahar
20K+ Views
Constructors are special methods used to initialize objects, whereas methods are used to execute certain statements. Constructors and methods are both blocks of code inside a class, but they have different purposes. In this article we will learn about the main differences between a constructor and a method. What ... Read More

Mahesh Parahar
28K+ Views
Static SQLStatic SQL refers to those SQL statements which are fixed and can be hard coded into the application. As static sqls are fixed queries, these statements can be analyzed and optimized and do not require any specific handling for security purposes.Dynamic SQLDynamic SQL refers to those SQL statements which ... Read More

Mahesh Parahar
25K+ Views
Class A class is a blueprint from which individual objects are created. A class can contain any of the following variable types. Local Variables − Variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed ... Read More

Mahesh Parahar
43K+ Views
Graph coloring is the procedure of assignment of colors to each vertex of a graph G such that no adjacent vertices get same color. The objective is to minimize the number of colors while coloring a graph. The smallest number of colors required to color a graph G is called ... Read More

Mahesh Parahar
43K+ Views
It is the number of vertices adjacent to a vertex V. Notation − deg(V). In a simple graph with n number of vertices, the degree of any vertices is − deg(v) = n – 1 ∀ v ∈ G A vertex can form an edge with all other vertices except ... Read More

Mahesh Parahar
19K+ Views
LinuxLinux is an open source multi-tasking, multi-user operating system. It was initially developed by Linus Torvalds in 1991. Linux OS is widely used in desktops, mobiles, mainframes etc.UnixUnix is multi-tasking, multi-user operating system but is not free to use and is not open source. It was developed in 1969 by ... Read More

Mahesh Parahar
43K+ Views
Whether it is possible to traverse a graph from one vertex to another is determined by how a graph is connected. Connectivity is a basic concept in Graph Theory. Connectivity defines whether a graph is connected or disconnected.ConnectivityA graph is said to be connected if there is a path between ... Read More

Mahesh Parahar
29K+ Views
A list can be converted to a set object using Set constructor. The resultant set will eliminate any duplicate entry present in the list and will contains only the unique values.Set set = new HashSet(list);Or we can use set.addAll() method to add all the elements of the list to the ... Read More

Mahesh Parahar
28K+ Views
A List of elements can be copied to another List using multiple ways.Way #1Create a List by passing another list as a constructor argument.List copyOflist = new ArrayList(list);Create a List and use addAll() method to add all the elements of the source list.Way #2List copyOfList = new ArrayList(); copyOfList.addAll(list);Way #3Use ... Read More