@Test public void key_input123456_2_return4() throws Exception { int actual = key(123456, 2); Assert.assertEquals(4, actual); }
private int key(Integer element, int digit) throws IllegalArgumentException { return -1; }
RadixSort { private int key(Integer element, int digit) throws IllegalArgumentException { return -1; } }
RadixSort { private int key(Integer element, int digit) throws IllegalArgumentException { return -1; }  }
RadixSort { private int key(Integer element, int digit) throws IllegalArgumentException { return -1; }  void sort(Integer[] elements); }
RadixSort { private int key(Integer element, int digit) throws IllegalArgumentException { return -1; }  void sort(Integer[] elements);  }