PrintFactors.java

import java.util.Scanner;

public class PrintFactors {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a limit: ");
        int limit = Integer.parseInt(scan.nextLine());
        while(limit < 0) {
            System.out.println("Input must be positive!");
            System.out.print("Enter a limit: ");
            limit = Integer.parseInt(scan.nextLine());
        }

        int num = 1;
        while(num <= limit) {
            System.out.printf("Factors of %,d: ",num);
            printFactors(num);
            System.out.println();
            num ++;
        }
    }

    public static void printFactors(int num) {
        for (int i = 1; i <= num; ++i) {
            if (num % i == 0) {
                System.out.print(i + " ");
            }
        }
    }
}