1. The Boolean (logical) data type boolean

2. Logical data type: boolean
The boolean data type:
is a built-in (primitive) data type of Java
is used to represent the logical values
There are 2 logical values:
     
true
false    

3. Logical data type: boolean (cont.)
Encoding scheme used in the boolean data type:
uses 1 byte of memory (to store 0 or 1)
0 represents true
1 represents false

4. Boolean literals
There are 2 boolean literals (= logical constants) in Java:
These 2 words are keywords (reserved words) in Java
true and,
false    

5. Defining boolean typed variables
Syntax to define an boolean typed variable:
Notes:
boolean NameOfVariable ;
The keyword boolean announces the variable definition clause
The NameOfVariable is an identifier which is the name of the variable.
The variable definition clause is must be ended with a semi-colon ";"
A boolean typed variable can store true (1) or false (0)

6. Defining boolean typed variables (cont.)
Example:
public class Boolean01 {
public static void main(String[] args)
boolean a; // boolean typed variable
a = true;
System.out.println(a); // prints true
a = false;
System.out.println(a); // prints false
a = (3 > 1); // 3 > 1 evals to true, so: a = true
a = (3 <= 1); // 3 <= 1 evals to false, so: a = false }

7. Defining boolean typed variables (cont.)
Example Program: (Demo above code)
Prog file:
How to run the program:            
Right click on link and save in a scratch directory
To compile:   javac Boolean01.java
To run:          java Boolean01

8. Operations that return a boolean result
There are 2 types of operators that return a boolean result (true or false):
Compare operators:
A compare operator compares 2 numerical expressions and return a Boolean result.
Example:
the compare operation 3 > 1 returns the Boolean value true

9. Operations that return a boolean result (cont.)
Logical operators:
A logical operator compares 2 Boolean (logical) expressions and return a Boolean result.
Example:
the logical operation true AND false returns the Boolean value false

10. Operations that return a boolean result (cont.)
We will discuss the compare operators next and discuss the logical operators after a few webpages.