IterableWarmups.java

package Iterable.Practice;

import java.util.ArrayList;
import java.util.List;

public class IterableWarmups {
    public static void main(String[] args) {

        List<Integer> numbers = new ArrayList<>();

        numbers.add(3);
        numbers.add(7);
        numbers.add(10);
        numbers.add(4);
        numbers.add(8);

        System.out.println("Sum: " + sum(numbers));
        System.out.println("Even count: " + countEven(numbers));
        System.out.println("Max value: " + findMax(numbers));
    }


    /*
    PROBLEM 1
    Return the sum of all numbers in the iterable
     */
    public static int sum(Iterable<Integer> numbers) {

        int total = 0;

        // TODO:
        // Use a for-each loop to calculate the sum
        for (Integer num : numbers) {
            total += num;
        }

        return total;
    }


    /*
    PROBLEM 2
    Count how many numbers are even
     */
    public static int countEven(Iterable<Integer> numbers) {

        int count = 0;

        // TODO:
        // Loop through numbers
        // Increment count if number is even
        for (Integer num : numbers) {
            if (num % 2 == 0) {
                count++;
            }
        }
            return count;
        }



    /*
    PROBLEM 3
    Return the maximum value
     */
        public static int findMax (Iterable < Integer > numbers) {

            int max = Integer.MIN_VALUE;

            // TODO:
            // Loop through numbers
            // Update max if current number is larger
            for (Integer num : numbers) {
                if (num > max) {
                    max = num;
                }
            }

            return max;
        }


    /*
    PROBLEM 4 (BONUS)
    Count how many times a word appears
     */
        public static int countMatches (Iterable < String > words, String target){

            int count = 0;

            // TODO:
            // Loop through words
            // Compare each word to target
            for (String word : words) {
                if (word.equals(target)) {
                    count++;
                }
            }

            return count;
        }
    }