Prime Factor Program in Java

class PrimeFactors
{
public static void main(String args[])
{
int num =9;
int i , j , flag =0;
System.out.println("The Prime Factors for number "+num+"  are :");
for(i=0;i<n;i++)
{
if(n % i == 0)
{
for(j=2;j<i;j++)
{
if(i%j==0)
{
flag =1;
break;
}
else
{
flag=0;
}
}
if(flag == 0|| i == 2)
{
System.out.println(" "+i);
}
}
}
}
}