The Relational Operators in Java are used to compare two variables and, what if we want to compare more than one condition? Very simple, logical operators will do the trick for you.
Java Logical operators are used to combine two or more conditions and perform the logical operations using && (Logical AND), || (Logical OR) and ! (Logical NOT). Below table describes them
| OPERATORS | NAME | DESCRIPTION | EXAMPLE |
|---|---|---|---|
| && | logical AND | It will return true when both conditions are true | If (age > 18 && age <= 25) |
| || | logical OR | It will returns true when at-least one of the condition is true | If (age == 35 || age < 60) |
| ! | logical NOT | If the condition is true, logical NOT operator makes it false | If age = 18 then!( age = 18) returns false. |
Let us see the truth tables behind the logical operators in Java for better understanding
&& (LOGICAL AND) Truth table
| Condition 1 | Condition 2 | Condition 1 && Condition 2 |
|---|---|---|
| True | True | True |
| True | False | False |
| False | True | False |
| False | False | False |
|| (LOGICAL OR) Truth table
| Condition 1 | Condition 2 | Condition 1 || Condition 2 |
|---|---|---|
| True | True | True |
| True | False | True |
| False | True | True |
| False | False | False |
Java Logical Operators example
This example will help you understand, how logical operators in Java Programming are used in If statements. For this example, We are one integer variables inside the If Statement along with relational and logical operator to perform condition check.
JAVA CODE
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// Using Java Logical Operators in Else If Statement package JavaOperators; import java.util.Scanner; public class LogicalOperators { private static Scanner sc; public static void main(String[] args) { int age; sc = new Scanner(System.in); System.out.println(" Please Enter Your Age: "); age = sc.nextInt(); if (!(age > 18)) { System.out.println("You are Too Young"); } else if (age > 18 && age <= 35) { System.out.println("Young Man"); } else if (age == 36 || age <= 60) { System.out.println("You are Middle Age Person"); } else { System.out.println("You are too Old"); } } } |
OUTPUT
From the below screenshot you can observe that, we entered age = 12. It means age is not greater than 18 so, Second first statement is printed
Let us see what will happen when we change the values. From the below screenshot you can observe that, we entered age = 28. It means age is between 18 and 35 so, Second statement is printed
From the below screenshot you can observe that, we entered age = 56. It means age is between 36 and 60 so, third statement is printed
From the below screenshot you can observe that, we entered age = 65.
ANALYSIS
Following statement will ask the user to enter his / her age and we are going to assign the user input value to respected variable.
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System.out.println(" Please Enter Your Age: "); age = sc.nextInt(); |
Else If Condition
Following If statement will check whether age is not greater than 18 (technically, age is less than 18 or not). If the condition is True, statement inside the If block is executed
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if (!(age > 18)) { System.out.println("You are Too Young"); } |
Following If statement will check whether age is greater than 18 and age is less than or equal to 35. If both these conditions are True, statement inside the Else If block is executed
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else if (age > 18 && age <= 35) { System.out.println("Young Man"); } |
Following If statement will check whether age is equal to 36 and age is less than or equal to 60. If both these conditions are True, statement inside the Else If block is executed
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else if (age == 36 || age <= 60) { System.out.println("You are Middle Age Person"); } |
If everything fails then statement inside the else block will be executed.
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System.out.println("You are too Old"); |
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