Logical Operator

Logical operator is used to perform the operation on two operands with boolean type . The result of this operation also will be boolean type. Here is a table showing logical operator:

Operator	Description
&&	AND
||	OR
^	XOR (exclusive OR)
!	NOT (negation)

If there are two boolean operands (for example: A and B) and both are used in AND, OR, XOR, and NOT operation, then the resulting values are as follows:

A	B	A && B	A || B	A ^ B	!A
true	true	true	true	false	false
true	false	false	true	true	false
false	true	false	true	true	true
false	false	false	false	false	true

As shown in table above, the AND operation will only return true if both operands (A and B) are true; OR operation will only return false if the second operand is false; XOR operation will only return true if either of its operands (not both) are true; while the NOT operation will return the negation or reversal of a previous value.

Here is an example of code that will show the values ​​resulting from table above

class LogicalOperatorDemo {

   public static void main(String[] args) {

      System.out.println("AND operation");
      System.out.println("true && true = " + (true && true));
      System.out.println("true && false = " + (true && false));
      System.out.println("false && true = " + (false && true));
      System.out.println("false && false = " + (false && false));
      System.out.println();

      System.out.println("OR operation");
      System.out.println("true || true = " + (true || true));
      System.out.println("true || false = " + (true || false));
      System.out.println("false || true = " + (false || true));
      System.out.println("false || false = " + (false || false));
      System.out.println();

      System.out.println("XOR operation");
      System.out.println("true ^ true = " + (true ^ true));
      System.out.println("true ^ false = " + (true ^ false));
      System.out.println("false ^ true = " + (false ^ true));
      System.out.println("false ^ false = " + (false ^ false));
      System.out.println();

      System.out.println("NOT operation");
      System.out.println("!true = " + (!true));
      System.out.println("!false = " + (!false));
   }
}

The results will be given by the above program as follows:

AND operation
true && true = true
true && false = false
false && true = false
false && false = false

OR operation
true || true = true
true || false = false
false || true = false
false || false = false

XOR operation
true ^ true = true
true ^ false = false
false ^ true = false
false ^ false = false

NOT operation
!true = false
!false = true