Introduction to Programming

Logical operators:  !  &  |  

Let's define each of the logical operators first: 

• The unary operator ! returns true if the operand is false and returns false otherwise
• The binary operator & returns true if both of the operands are true
• The binary operator | returns true if at least one of the operands is true

Here is the demo code:

boolean x = false;System.out.println(!x);  //prints: trueSystem.out.println(!!x); //prints: falseboolean y = !x;System.out.println(y & x); //prints: falseSystem.out.println(y | x); //prints: trueboolean z = true;System.out.println(y & z); //prints: trueSystem.out.println(y | z); //prints: true

Notice that the ! operator can be applied to the same value several times.