Logical Operators
As with comparison operators, you can also test for true or false values with logical operators.
Logical operators are used to determine the logic between variables or values, by combining multiple conditions::
| Operator | Name | Description | Example | Try it |
|---|---|---|---|---|
| && | Logical and | Returns true if both statements are true | x < 5 && x < 10 | |
| || | Logical or | Returns true if one of the statements is true | x < 5 || x < 4 | |
| ! | Logical not | Reverse the result, returns false if the result is true | !(x < 5 && x < 10) |
Real-Life Example: Login Check
The example below shows how logical operators can be used in a real situation, e.g. when checking login status and access rights:
Example
boolean isLoggedIn = true;
boolean isAdmin = false;
System.out.println("Regular user: " + (isLoggedIn && !isAdmin));
System.out.println("Has access: " + (isLoggedIn || isAdmin));
System.out.println("Not logged in: " + (!isLoggedIn));
Note: Logical operators often become easier to understand once you start using them inside
ifstatements, which you will learn about in the upcoming chapters.
