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How to sort ArrayList in java - List Sorting - Ascending Descending Order

How to sort ArrayList ascending descending order 
Sorting ArrayList in Java is not difficult, by using Collections.sort() method you can sort ArrayList in ascending and descending order in Java. Collections.sort() the method optionally accepts a Comparator and if provided it uses Comparator's compare method to compare Objects stored in Collection to compare with each other, in case of no explicit Comparator, Comparable interface's compareTo() method is used to compare objects from each other. If objects stored in ArrayList don't implement Comparable then they can not be sorted using Collections.sort() the method in Java.