import java.util.*;

public class Methods1 {
    public static void main(String[] args) {
        Random r = new Random();
        boolean result = seven(r);
        System.out.println();
        System.out.println("result = " + result);

        System.out.println("sum = " + digitSum(12345));
    }
	
    // returns the sum of the digits of n (assumes n is not negative)
    public static int digitSum(int n) {
        int sum = 0;
        while (n > 0) {
            int digit = n % 10;
            n = n / 10;
            sum += digit;
        }
        return sum;
    }
	
    // generates up to 10 numbers between 1 and 30 stopping if the "lucky
    // number" 7 comes up and returning whether or not that happened
    public static boolean seven(Random r) {
        for (int i = 1; i <= 10; i++) {
            int next = r.nextInt(30) + 1;
            System.out.print(next + " ");
            if (next == 7) {
                return true;
            }
        }
        return false;
    }
	
    // variation of the seven method that generates exactly 10 numbers between
    // 1 and 30 and that returns whether or not the "lucky number" 7 comes up
    // among the 10 numbers
    public static boolean seven2(Random r) {
        boolean seen7 = false;
        for (int i = 1; i <= 10; i++) {
            int next = r.nextInt(30) + 1;
            System.out.print(next + " ");
            if (next == 7) {
                seen7 = true;
            }
        }
        return seen7;
    }
}