Prime Numbers

/*This program prints all the prime numbers from lower limit l to upper limit u passed
as parameters*/
class PrimeNumbers
{
void printPrimeNumbers(int lower,int upper)
{
int i,j,flag;
for(i=lower;i<=upper;i++)
{flag=0;
for(j=2;j<=(i/2);j++)
{ if(i%j==0)
   flag=1;
}
if(flag==0)
System.out.println(i);
}
}
}