1. Logical “AND” Operator (&&)

This operator returns true when both the conditions under consideration are satisfied or are true. If even one of the two yields false, the operator results false.

Example:

package octopuscodes.com.demo;

public class Demo {

	public static void main(String[] args) {
		int a = 10, b = 5;
		
		boolean result1 = a > 3 && b > 2;
		System.out.println("result 1: " + result1);
		
		boolean result2 = a > 30 && b > 2;
		System.out.println("result 2: " + result2);
	}

}

Output:

result 1: true
result 2: false

2. Logical “OR” Operator (||)

This operator returns true when one of the two conditions under consideration is satisfied or is true. If even one of the two yields true, the operator results true. To make the result false, both the constraints need to return false.

Example:

package octopuscodes.com.demo;

public class Demo {

	public static void main(String[] args) {
		int a = 10, b = 5;
		
		boolean result1 = a > 3 || b > 2;
		System.out.println("result 1: " + result1);
		
		boolean result2 = a > 30 || b < 2;
		System.out.println("result 2: " + result2);
	}

}

Output:

result 1: true
result 2: false

3. Logical “NOT” Operator (!)

This operator is a unary operator and returns true when the condition under consideration is not satisfied or is a false condition.

Example:

package octopuscodes.com.demo;

public class Demo {

	public static void main(String[] args) {
		int a = 10, b = 5;
		
		boolean result1 = !(a > 3 || b > 2);
		System.out.println("result 1: " + result1);
		
		boolean result2 = !(a > 30 || b < 2);
		System.out.println("result 2: " + result2);
	}

}

Output:

result 1: false
result 2: true

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