public class Quick extends Object
Quick
class provides static methods for sorting an
array and selecting the ith smallest element in an array using quicksort.
For additional documentation, see Section 2.3 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.
Modifier and Type  Method and Description 

static void 
main(String[] args)
Reads in a sequence of strings from standard input; quicksorts them;
and prints them to standard output in ascending order.

static Comparable 
select(Comparable[] a,
int k)
Rearranges the array so that
a[k] contains the kth smallest key;
a[0] through a[k1] are less than (or equal to) a[k] ; and
a[k+1] through a[n1] are greater than (or equal to) a[k] . 
static void 
sort(Comparable[] a)
Rearranges the array in ascending order, using the natural order.

public static void sort(Comparable[] a)
a
 the array to be sortedpublic static Comparable select(Comparable[] a, int k)
a[k]
contains the kth smallest key;
a[0]
through a[k1]
are less than (or equal to) a[k]
; and
a[k+1]
through a[n1]
are greater than (or equal to) a[k]
.a
 the arrayk
 the rank of the keyk
IllegalArgumentException
 unless 0 <= k < a.length
public static void main(String[] args)
args
 the commandline arguments