Mode.java

import java.util.ArrayList;

public class Mode {

    // find 1 or more modes from an array
    // the mode is the most repeated successive number
    // there can be more than one mode

    /**
    *   Program:    Modes.java
    *   Purpose:    Yahoo! Answers
    *   Creator:    Chris Clarke
    *   Created:    30.11.2013
    */

    public static void main(String[] args) {
        // test data
        int[] num = {2,2,3,4,7,7,7,8,8,8}; // removed an 8 - for test purposes

        ArrayList<Integer> numberList    = new ArrayList<>(); // number
        ArrayList<Integer> frequencyList = new ArrayList<>(); // frequency
        ArrayList<Integer> modeList      = new ArrayList<>(); // 1 or more max repeats

        int repeats = 1;    // starts with 1 of current number
        int max = 1;        // max is 1 to begin with

        for (int x=0; x < num.length; x++) {
            if (x < num.length-1) {
                if (num[x] == num[x+1]) { // a repeated number
                    if (++repeats > max) {
                        max = repeats;
                    } // end if repeats
                } else {
                    if (!numberList.contains(num[x])) {
                        numberList.add(num[x]); // add the number to list
                        frequencyList.add(repeats); // add frequency to list
                    } // end if
                    repeats = 1; // new number, not repeat
                } // end if num
            } else {
                if (!numberList.contains(num[x])) {
                    numberList.add(num[x]); // add the number to list
                    frequencyList.add(repeats); // add frequency to list
                } // end if
                repeats = 1;
            } // end if x

        } // end for

        // find all numbers whose frequency = max
        for (int i=0; i<frequencyList.size(); i++) {
            if (frequencyList.get(i) == max) {
                modeList.add(numberList.get(i));
            } // end if
        } // end for

        // output result(s)
        System.out.print("The numbers are ");
        for (int i: num) {
            System.out.printf("%d ", i);
        } // end for

        System.out.println("\nnumberList = "+numberList);
        System.out.println("frequencyList = "+frequencyList);
        System.out.println("Mode(s) = "+modeList);
    } // end main()
} // end class