Dremendo Tag Line

Logical Operators in Java

Operators in Java

In this lesson, we will learn what is the Logical Operators and how it works in Java programming with some examples.

What is Logical Operators

Logical operators in Java are used to evaluate two or more conditions. They allow a program to make a decision based on multiple conditions. If the result of the logical operator is true then 1 is returned otherwise 0 is returned.

There are 3 types of logical operators in Java and they are:

  • && AND
  • || OR
  • ! NOT

Now let's see the examples of all the logical operators one by one for more understanding.

video-poster

&& AND Operator

&& (AND) operator is used to check if two or more given conditions are true or not. The output of && (AND) operator is 1 (true) only if all the given conditions are correct otherwise the output will be 0 (false) if any one of the given conditions is wrong.

Example

int x=15, y=2, z=6, k=25, a, b;
a=x>5 && y<6 && k>=25;     // output of a is 1
b=x>y && k<25;             // output of b is 0

In the example above the output of a is 1 because all the three given conditions x>5, y<6 and k>=25 are correct (true). On the other hand the output of b is 0 because out of the two given conditions x>y and k<25 the second condition k<25 is wrong (false).

|| OR Operator

|| (OR) operator is used to check if any one of the given conditions is true or not. The output of || (OR) operator is 1 (true) if at least any one of the given conditions is correct otherwise the output will be 0 (false) only if all the given conditions are wrong.

Example

int x=15, y=2, z=6, k=25, a, b;
a=x<5 || y<6 || k>=25;     // output of a is 1
b=x<y || k<25;             // output of b is 0

In the example above the output of a is 1 because out of the three given conditions x<5, y<6 and k>=25 the second condition is correct (true). On the other hand the output of b is 0 because out of the two given conditions x<y and k<25 both of them are wrong (false).

! NOT Operator

! (NOT) operator negates the value of the condition. If the condition is false then the output of ! (NOT) operator becomes true (1). If the condition is true then the output of ! (NOT) operator becomes false (0).

Example

int x=15, y=10, a, b;
a=!(x>5);     // output of a is 0
b=!(y<5);     // output of b is 1

In the example above the output of a is 0 because the given condition x>5 is correct (true) so ! (NOT) operator changed the output from 1 to 0. On the other hand the output of b is 1 because the given condition y<5 is wrong (false) so ! (NOT) operator changed the output from 0 to 1.

Test Your Knowledge


You Scored :

Percentage :