Java Basic algorithm interview question: 2 Judging and outputting prime number

Title: Determine the number of primes between 101-200 and the output of all primes.
Program Analysis: The method of judging primes: to remove 2 to sqrt (this number) with a number, if divisible, indicates that the number is not a prime, and vice versa is a prime.

public class test001{
public static void Main (string[] args) {
System.out.println ("Prime number between 100 and 200:");
SYSTEM.OUT.PRINTLN ("Total number of primes:" +prime ());
}
public static int prime () {
int count=0;
for (int i=100;i<200;i++) {
Boolean flag = true;
for (int j=2;j<=math.sqrt (i); j + +) {
if (i%j==0) {
Flag = false;
Break
}
}

if (flag==true) {
count++;
System.out.println (i);
}
}
return count;
}
}

21 prime number of outputs

Java Basic algorithm interview question: 2 Judging and outputting prime number