Java Tutorial: Relational and Logical Operators in Java

Relational Operators in Java : 

Relational operators are used to evaluate conditions (true or false) inside the if statements. Some examples of relational operators are:

• == (equals)
• >= (greater than or equals to)
• > (greater than)
• < (less than)
• <= (less than or equals to)
• != (not equals)

Note: ‘=’ is used for an assignment whereas ‘==’ is used for equality check. The condition can be either true or false.

Logical Operators : 

• Logical operators are used to provide logic to our Java programs.
• There are three types of logical operators in Java :
• && - AND
• || - OR
• ! – NOT

AND Operator : 

Evaluates to true if both the conditions are true.

• Y && Y = Y                
• Y && N = N
• N && Y = N
• N && N = N

Convention: # Y – True and N - False

OR Operator :

Evaluates to true when at least one of the conditions is true.

• Y || Y = Y                   
• Y || N = Y
• N || Y = Y
• N || N = N

Convention: # Y – True and N - False

NOT Operator :

Negates the given logic (true becomes false and vice-versa)

• !Y = N                         
• !N = Y

Code as Described in the Video

package com.company;

public class cwh_17_logical {
    public static void main(String[] args) {
        System.out.println("For Logical AND...");
        boolean a = true;
        boolean b = false;
//        if (a && b){
//            System.out.println("Y");
//        }
//        else{
//            System.out.println("N");
//        }

        System.out.println("For Logical OR...");

//        if (a || b){
//            System.out.println("Y");
//        }
//        else{
//            System.out.println("N");
//        }

        System.out.println("For Logical NOT");
        System.out.print("Not(a) is ");
        System.out.println(!a);
        System.out.print("Not(b) is ");
        System.out.println(!b);
    }
}

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