My solution to the Item Frequency problem.

TechInterviewDriver.java

package tech.scolton.jordan;

import java.util.*;

public class TechInterviewDriver {
    public static void main(String[] args) {
        String[] input = new String[]{"apple", "apple", "orange"};
        Map<String, Integer> itemFreq = new HashMap<>();

        for (String s : input) {
            itemFreq.putIfAbsent(s, 0);
            itemFreq.put(s, itemFreq.get(s) + 1);
        }

        List<Map.Entry<String, Integer>> entries = new ArrayList<>(itemFreq.entrySet());
        entries.sort((x, y) -> y.getValue().compareTo(x.getValue()));

        for (Map.Entry<String, Integer> entry : entries)
            System.out.println(entry.getKey() + ": " + entry.getValue());
    }
}