Java Boolean Data Types — Java interactive lesson

Boolean Types

Very often in programming, you will need a data type that can only have one of two values, like:

YES / NO
ON / OFF
TRUE / FALSE

For this, Java has a boolean data type, which can only take the values true or false :

Example

boolean isJavaFun = true;
boolean isFishTasty = false;
System.out.println(isJavaFun);     // Outputs true
System.out.println(isFishTasty);   // Outputs false

Boolean values are mostly used for conditional testing.

You will learn much more about booleans and conditions later in this tutorial.