Booleans #

What is Boolean? #

Boolean is a data type that can have only two opposite values like

• on or off
• yes or no
• true or false

In Java the boolean type can store true or false values.

Boolean Variables #

A boolean variable is declared with boolean type and then either true or false is assigned to that variable.

boolean isDoorOpen = true;
boolean isCameraOpen = false;

System.out.println(isDoorOpen);     // outputs true
System.out.println(isCameraOpen);   // outputs false

Boolean Expressions #

Boolean expressions are evaluations that produce a boolean result, such as comparision.

For example if we need to control if someone has a right to vote we can use comparision with an if statement.

int ageOfVoter = 21
if (ageOfVoter >= 18) {
	System.out.println("Has right to vote.");
}
else {
	System.out.println("Does not have right to vote!");
}