Method to calculate prime numbers - [JAVA] -

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i need build method calculates prime number homework. implemented algorithm proposed professor it's not working.

eclipse gives message: the local variable prime may not have been initialized , not compile.

can me?

public static boolean itsprime(int nbtest){      boolean prime;      if (nbtest <= 1){          prime = false;     } else if (nbtest == 2){       // 2 number prime         prime = true;     } else if ((nbtest != 2) && (nbtest % 2 == 0)){    // if it's , different 2 not prime         prime = false;     } else {         for(int = 3; <= math.sqrt(nbtest); = i+2){              if (nbtest % == 0){                 prime = false;             } else {                 prime = true;             }         }        }      return prime; }

just initialise when declare variable. eg

boolean prime = false;

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