Android - Array nach mehreren Kriterien sortieren

public class MainActivity extends Activity {

	private static final String LOG_TAG = "Leon";  
	private final static String MUTANT = "MUTANTEN";  
	private final static int procedures = 100;

	TextView output;
	Button comparebutton;

	protected void onCreate(Bundle savedInstanceState) {
		Log.d(LOG_TAG, "MainActivity/onCreate");  
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		output = (TextView) findViewById(R.id.output);
		comparebutton = (Button) findViewById(R.id.comparebutton);

		output.setMovementMethod(new ScrollingMovementMethod());

		comparebutton.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {

				InputMethodManager inputManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
				inputManager.hideSoftInputFromWindow(output.getWindowToken(), 0);
				main();
			}
		});

	}

	public static void main() {

		List<mutant> mutantenListe = new ArrayList<mutant>();

		for (int i = 0; i < procedures; i++) {
			double randomForLenght = Math.random();
			double randomLength = (randomForLenght * MUTANT.length() * 2);
			String word = "";  
			for (int j = 0; j < randomLength; j++) {
				double randomForWord = Math.random();
				double randomWord = randomForWord * 26 + 1;
				int randomAsciiNumber = (int) (randomWord + 64);
				char character = (char) randomAsciiNumber;
				word += character;
			}
			mutantenListe.add(new mutant(word));
			Comparator<mutant> comparator = new mutantCompare();
			// Custom Sort
			java.util.Collections.sort(mutantenListe, comparator);
			// print sorted array to console
			System.out.println(Arrays.deepToString(mutantenListe.toArray()));
		}
	}

	public static class mutant {
		private int matchedChars;
		private String mut_name;

		public mutant(String mutantname) {
			Log.d(LOG_TAG, "test");  
			mut_name = mutantname;
			if (mutantname.length() > 0) {
				for (int y = 0; y < mutantname.length(); y++) {
					char s1 = MUTANT.charAt(y);
					char s2 = mutantname.charAt(y);
					if (s1 == s2) {
						matchedChars += 1;
					} else {
						break;
					}
				}
			}
		}

		public int getMatchedChars() {
			return matchedChars;
		}

		@Override
		public String toString() {
			return mut_name;
		}

	}

	public static class mutantCompare implements Comparator<mutant> {
		public int compare(mutant o1, mutant o2) {
			Log.d(LOG_TAG, "test2");  
			int m1 = o1.getMatchedChars();
			int m2 = o2.getMatchedChars();

			if (m1 > m2)
				return -1;
			if (m1 < m2)
				return 1;
			if (m1 == m2) {
				if (o1.toString().length() > o2.toString().length()) {
					return -1;
				} else {
					return 1;
				}
			}
			return 0;
		}
	}