public static String[] sortStrings( String[] input ) {
    Arrays.sort( input );
    return input;
  }
@Test
  public void testSortStrings() {
    String[] arr1 = { "Red", "Blue", "Black", "Black", "Green" };
    String[] arr2 = { "aaa", "zzz", "yyy", "sss", "ttt", "t" };
    String[] arr3 = { "A", "B", "C", "D" };

    String[] results = Const.sortStrings( arr1 );
    assertTrue( isArraySorted( arr1 ) );
    assertTrue( isArraySorted( results ) );

    results = Const.sortStrings( arr2 );
    assertTrue( isArraySorted( arr2 ) );
    assertTrue( isArraySorted( results ) );

    results = Const.sortStrings( arr3 );
    assertTrue( isArraySorted( arr3 ) );
    assertTrue( isArraySorted( results ) );
  }