ArrayOfStringsFrequency.java

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Arrays;
import java.util.TreeSet;

/*
Report the frequency of 100k random selections of strings in an array 
*/

public class ArrayOfStrings {

    static String[] wordCorpusStrings = { "Achilles", "Hector", "Zeus", "Homer", "Iliad", "Troy", "Odysseus", "Agamemnon",
            "War","Hero", "Clytymestra", "Priam", "Aeneas", "Paris", "Helen", "Aphrodite", "Apollo", "Athena", "Hera", "Breisis",};

    @FunctionalInterface
    interface A {
        String[] randomStrings(int numberOfStrings, List<String> randomStrings, Random random);
    }

    public static void main(String[] args) {

        A obj = (int numberOfStrings, List<String> randomStrings, Random random) -> {
            for (int i = 0; i < numberOfStrings; i++) {
                randomStrings.add(wordCorpusStrings[random.nextInt(wordCorpusStrings.length)]);
            }
            return randomStrings.toArray(new String[0]);
        };

        String[] strings = obj.randomStrings(100000, new ArrayList<>(), new Random());

        Arrays.sort(strings);
        TreeSet<String> set = new TreeSet<>();
        set.addAll(Arrays.asList(strings));

        System.out.println("all Strings\n");
        for (String string : strings) {
            System.out.println(string);
        }
        System.out.println("\nUnique Strings\n");
        for (String string : set) {
            System.out.println(string);
        }

        System.out.println("\nFrequencies\n");
        for (String string : set) {
            int start = Arrays.asList(strings).indexOf(string);
            int frequency = 0;
            for (int i = start; i < strings.length; i++) {
                if (strings[i].equals(string)) {
                    frequency++;
                } else {
                    break;
                }
            }
            String s = String.format("%s : %d", string, frequency);
            System.out.println(s);
        }
    }
}