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JAVA

Java Tutorials

Java Introduction

Java Get Started

Java Syntax

Java Comments

Java Variables

Java Data Types

Java Type Casting

Java Operators

Java Strings

Java Math

Java Booleans

Java If...Else

Java Switch

Java While Loop

Java For Loop

Java Break/Continue

Java Arrays

Java Methods

Java Methods

Java Method Parameters

Java Methods Overloading

Java Scope

Java Recursion

Java Classes

Java OOP

Java Classes/Objects

Java Class Attributes

Java Class Methods

Java Constructors

Java Modifiers

Java Encapsulation

Java Packages / API

Java Inheritance

Java Polymorphism

Java Inner Classes

Java Abstraction

Java Interface

Java Enums

Java User Input

Java Date

Java ArrayList

Java LinkedList

Java HashMap

Java HashSet

Java Iterator

Java Wrapper Classes

Java Exceptions

Java RegEx

Java Threads

Java Lambda

Java File Handling

Java Files

Java Create/Write Files

Java Read Files

Java Delete Files

Java Booleans

Java Booleans

In most cases, in applications, you will need a data type that can be only one of two values, such as:

YES / NO
ON / OFF
TRUE / FALSE

In this case, Java has a boolean data type, which can take values true or false.

Boolean Values

The boolean type is declared by the boolean keyword and can only take values true or false:

Example

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

However, it is very common to return boolean values from boolean expressions, for conditional testing (see below).

Boolean Expression

Boolean expression is a Java expression that returns the Boolean value: true or false.

You can use operator comparisons, such as operator greater than (>) to determine if the expression (or alternative) is true:

Example

int x = 10;
int y = 9;
System.out.println(x > y); // returns true, because 10 is higher than 9

Or even easier:

Example

System.out.println(10 > 9); // returns true, because 10 is higher than 9

In the examples below, we use an operator equal to (==) to check the expression:

Example

int x = 10;
System.out.println(x == 10); // returns true, because the value of x is equal to 10

Example

System.out.println(10 == 15); // returns false, because 10 is not equal to 15

The Boolean value of speech is the basis for all Java terms and conditions.

You will learn more about conditions in the next chapter.

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