用java程序编程2到100之间所有素数之和

public class PrimeNumber
{
public static void main (String arg[])
{
int sum = 2;
for (int i = 3; i < 100; i +=2) {
if (isprime(i))
sum += i;
}
}
public static boolean isprime(int n){
for (int i = 3; i < n; i++) {
if ((n%i)==0)  return false;
}
return true;
}
}