What is the time complexity of the code

#1

import java.util.*;
public class Main {
public static void main(String args[]) {

    Scanner scn = new Scanner(System.in);
    int t = scn.nextInt();
    while (t-- > 0) {
        int a = scn.nextInt(), b = scn.nextInt();

        int[] primes = new int[b + 1];
        primes[0] = 0;
        primes[1] = 0;

        for (int i = 2; i <= b; i++) {
            if ((i & 1) == 0 || i < a) {
                primes[i] = 0;
            } else {
                primes[i] = 1;
            }
        }
        if (2 >= a) {
            primes[2] = 1;
        }
        for (int i = 3; i <= b; i += 2) {

            int j = 2;
            while (i * j <= b) {
                primes[i * j] = 0;
                j++;
            }
        }

        int count = 0;
        for (int i = 0; i <= b; i++) {
            if (primes[i] == 1) {
                count++;
            }
        }

        System.out.println(count);
    }
}

}

#2

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