Mode Of Numbers In Java Example

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import java.util.*;

public class JavaModeOfNumbers {

	public static void main(String[] args) {

		int numbers[] = new int[] { 8, 13, 10, 9, 10, 12, 
				9, 11, 12, 9, 8, 8 };

		// list of all the numbers
		List<Integer> list = new ArrayList<Integer>();

		// list of all the numbers with no duplicates
		TreeSet<Integer> tree = new TreeSet<Integer>();

		for (int i = 0; i < numbers.length; i++) {
			list.add(numbers[i]);
			tree.add(numbers[i]);
		}

		System.out.println("list: " + list);
		System.out.println("tree: " + tree);

		// Contains all the modes
		List<Integer> modes = new ArrayList<Integer>();

		int highmark = 0;
		for (Integer x : tree) {
			int freq = Collections.frequency(list, x);
			if (freq == highmark) {
				modes.add(x);
			}
			if (freq > highmark) {
				modes.clear();
				modes.add(x);
				highmark = freq;
			}
		}
		System.out.println("modes: " + modes);

	}
}

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