How To Declare a Variable - Java Tutorial For Absolute Beginners

In this video I am discussing on the topic of Variables in Java

Variables are nothing but reserved memory locations to store values. It is actually a container that holds value for you, during the life of a Java program.

What we need to know when declaring a variable • Every variable must have a data type which determines the type and range of values it can contain. • The value stored in a variable can be changed during program execution. • A variable is only a name given to a memory location; all the operations done on the variable affects that memory location. • In Java, all the variables must be declared before being used. That means that in order to use a variable in a program you to need to declare it first

Examples of valid variable declarations are: int age;

float pi;

double d;

char a;

String car;

int a,b,c; // Another way to declare multiple variables having the same data type (make sure the variable names are separated by a comma)

All variables can only hold one value at a time and are declared pretty much the same way except Arrays

String [] names; // Arrays are used to store multiple values in a single variable, instead of declaring separate variables for each value

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