DUNOF - Don't Use the Negation Operator Frequently

The negation operator slows down the readability of the program, so it is recommended that it should not be used frequently.

Wrong

boolean isOk = verifySomewhat()
if ( !isOk )
    return 0;
else
    return 1;

Tip: Change your programm logic to avoid negation.

Right

boolean isOk = verifySomewhat()
if ( isOk )
    return 1;
else
    return 0;