Package java.util
Class Collections
static void sort(List l)
static void sort(List l, Comparator c)
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Description:
Sorts the specified list into ascending order. All elements in the list must be mutually comparable using the specified comparator (that is, c.compare(e1, e2) must not throw a ClassCastException for any elements e1 and e2 in the list). All elements in the list must implement the Comparable interface.
This sort is guaranteed to be stable: equal elements will not be reordered as a result of the sort.
sort(List l) method:
Sorts the specified list into ascending order, according to the natural ordering of its elements.
sort(List l, Comparator c) method:
Sorts the specified list according to the order induced by the specified comparator.