Bollean in java

 

Java Booleans

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 store true or false values.

Boolean Values

A boolean type is declared with the boolean keyword and 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 Expression
A Boolean expression returns a boolean value: true or false.
This is useful to build logic, and find answers.
For example, you can use a comparison operator, such as the greater than (>) operator, to find out if an expression (or a variable) is true or false:

Example
int x = 10;
int y = 9;
System.out.println(x > y); // returns true, because 10 is higher than 9
In the examples below, we use the equal to (==) operator to evaluate an expression:
Example
int x = 10;
System.out.println(x == 10); // returns true, because the value of x is equal to 10