In Java, variables are a mechanism to store values. There are different types of variables – the most commonly used variables are listed below:

boolean:

• A boolean is one of two values: true or false.
• Example instantiation: boolean done = false;

int:

• An int stores whole numbers (no decimals).
• Example instantiation: int x = 1;

double:

• A double stores decimals with up to 15 digits of precision.
• Example instantiation: double y = -1.479582834;

String:

• A String stores text using double quotes "".
• Example instantiation: String name = "Sam";

Printing Variables

int x = 7;
x = x + 2;

System.out.println("The value of x is " + x + ".");