Positive number

/* 
Positive number
Use the keyboard to enter three integers. Display the number of positive numbers in the original set.
*/

import java.io.*;
import java.util.Scanner;

public class Solution {
    public static void main(String[] args) throws Exception {
        
         Scanner sc = new Scanner(System.in);
        int[] a = new int[3];
        a[0] = sc.nextInt();
        a[1] = sc.nextInt();
        a[2] = sc.nextInt();
        
        int count = 0;
        for (int i = 0; i < 3; i++) {
            if (a[i] > 0) {
                count ++;
            }
        }
        
        System.out.println(count);
    }
}

Clean, simple but quite enough to solve the problem. Thanks for sharing :)