I wrote this simple implementation of the sum of primes for the code eval

Challenge Description:

 

Write a program which determines the sum of the first 1000 prime numbers.

I would like to know of a better - more efficient - way of implementing the solution.

import java.lang.Math;

public class SumOfPrimes {

    public static boolean isPrime(int n) {
        if (n < 2) {
            return false;
        }
        if (n == 2) {
            return true;
        }
        if (n % 2 == 0) {
            return false;
        }
        for (int i = 3; i <= Math.sqrt((double) n); i += 2) {
            if (n % i == 0) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        long sum = 0;

        for (int i = 1, count = 0; count < 1000; i++) {
            if (isPrime(i)) {
                sum += i;
                count++;
            }
        }
        System.out.print(sum);
    }

}

As for the primality test I only know of these other:

for (int divisor = 2; divisor < n; divisor++) {
    if (n % divisor == 0) {
        return false;
    }
}
return true;

and

for (int divisor = 2; divisor <= n/2; divisor++) {
    if (n % divisor == 0) {
        return false;
    }
}
return true;

I wrote this simple implementation of the sum of primes for the code eval

Challenge Description:

Write a program which determines the sum of the first 1000 prime numbers.

I would like to know of a better - more efficient - way of implementing the solution.

import java.lang.Math;

public class SumOfPrimes {

    public static boolean isPrime(int n) {
        if (n < 2) {
            return false;
        }
        if (n == 2) {
            return true;
        }
        if (n % 2 == 0) {
            return false;
        }
        for (int i = 3; i <= Math.sqrt((double) n); i += 2) {
            if (n % i == 0) {
                return false;
            }
        }
        return true;
    }

    public static void main(String[] args) {
        long sum = 0;

        for (int i = 1, count = 0; count < 1000; i++) {
            if (isPrime(i)) {
                sum += i;
                count++;
            }
        }
        System.out.print(sum);
    }

}

As for the primality test I only know of these other:

for (int divisor = 2; divisor < n; divisor++) {
    if (n % divisor == 0) {
        return false;
    }
}
return true;

and

for (int divisor = 2; divisor <= n/2; divisor++) {
    if (n % divisor == 0) {
        return false;
    }
}
return true;