Mau bagi2 Knowledge Java Console

cara membuat bilangan prima di java




import java.util.*;

public class ke4
{
public static void main(String[] args)
{
Scanner in = new Scanner (System.in);
int range=0,z=0;
int temp=0;
do
{
try
{
System.out.print("Masukkan angka Terakhir [2....]= ");
range =in.nextInt ();
z=0;
}catch (Exception e)
{
in.next();
z=1;
}
}while (z==1 || range<2);


for(int i = 2; i <=range; i++)
{
temp = 0;
for(int j = 1; j <= i; j++)
{
if(i % j == 0)
temp++;

}
if(temp == 2)
System.out.print(i + " ");
}

}
}


kalau kurang ngerti bisa tanya2 di message box ^^