netbeans - Java boolean method return -

i have boolean method in java program , i'm wondering why netbeans recommending making change code:

return isprime != 0; 

what wrote was:

if (isprime == 0) {             return false;          }         else{             return true;         } 

both work correctly cannot understand logic behind change netbeans suggesting. neither true or false being returned. explain me logic behind this? thanks

instead of

if (isprime == 0) {     return false; } else {     return true; } 

try

return (isprime != 0); 

it same thing, i'll show refactoring path. starting with

if (isprime == 0) {     return false; } else {     return true; } 

is same

if (isprime != 0) {     return true; } else {     return false; } 

which can reduced substitution, substituting 'isprime != 0' function 'doisprime()'

private boolean doisprime() {    return isprime != 0; } 

substituting in

if (doisprime()) {     // guaranteed same above!     return doisprime(); } else {     return doisprime(); } 

which can have both blocks reduced (as duplicated code)

if (doisprime()) { } return doisprime(); 

and reduced further removing if statement around empty block

return doisprime(); 

now undo substitution 'doisprime()' 'isprime != 0'

return isprime != 0; 

there no need substitution; but, find better shows off reasoning if statement redundant.