Common method of Java Arrays

1. Arrays.toString (Object [] a) an array of printing
2. Arrays.asList (Object [] a) converting the array into ArrayList
3. Arrays.sort (Object [] a) to sort the array
4. Arrays.binarySearch (Object [] a, Object key) using a binary search element index
5. Arrays.copyOf (Object [] original, int newLength) copy the array, and the specified length
6. Arrays.copyOfRange (Object [] original, int from, int to) copy the array, and specifies the start / end index (end not included)
7. Arrays.fill (Object [] a, Object val) to specify a packed array element