Core Java Fundamentals | Keywords | Identifiers | Variables | Core Java Basics | Quick Tutorial

Tutorial for keywords, identifiers, and variables in programming and how all these three are related to each other.

Variables are used to store information to be referenced and manipulated in a computer program. They also provide a way of labeling data with a descriptive name, so our programs can be understood more clearly by the reader and ourselves. It is helpful to think of variables as containers that hold information. Their sole purpose is to label and store data in memory. This data can then be used throughout your program.
Different programming languages provide a different set of reserved keywords, but there is one important & common rule in all the programming languages that we cannot use a reserved keyword to name our variables, which means we cannot name our variable like int or float rather these keywords can only be used to specify a variable data type.
Identifiers are symbols used to uniquely identify a program element in the code. They are also used to refer to types, constants, macros, and parameters. An identifier name should indicate the meaning and usage of the element being referred.
Let's look at these in a bit more detail.


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