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Array.sort(ArrayTosort,Comparator)

bharat bhasin
Greenhorn

Joined: Jul 19, 2009
Posts: 19
In the K&B example of Arrays.sort(ArrayTosort,Comparator) [Page 577 of SCJP 1.6 book, Chapter no. 7 same as in SCJP 1.5 book]
what value does ReSortComaprator classes object rs take when its declared by

rs = new ReSortComparator().

Its used with Arrays.sort( ), what role does the comparator play here??
Sebastian Janisch
Ranch Hand

Joined: Feb 23, 2009
Posts: 1183
The comparator executes the sort logic that you define.

As the sort method goes through your Array, it compares two objects using your Comparator instance. Depending on the result, the objects are shifted or not. This generates the sorted Array.


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Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 39478
    
  28
You have to implement the compare method in the Comparator interfaceOr something similar.

You can usually get away without overriding the equals() method.
 
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