Can explain about NOT(!) Logical operator with example?

Answer 1

not (!) is just the oposite.
example

true = true
false = false

!true = false
!false = true

when you use it on an statement:

if (7 != 6)
it will return true because 7 is not equal to 6.

Answer 2

Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false.

public class Test {

public static void main(String args[]) {
int num1 = 3;
int num2 = 5;

//num1 == num2 will return false, then use ! the result will be true
//will print in console num1 not equal num2

if ( !(num1 == num2) ){
System.out.println("num1 not equal num2");
}//end if
else{
System.out.println("num1 equal num2");
}//end else
}//end main
}//end class test

I hope I helped you.