Create Class for objects to be sorted. The result: Sorting the list in descending order example. Java - How to declare and initialize an Array, Java 8 - How to convert IntStream to Integer[]. Date.java We can further simplify the expression by not specifying the type definitions – the compiler is capable of inferring these on its own: – For Descending order, just use additional Comparator.reversed() method. One liner will be like : Collections.sort(arraylist, Collections.reverseOrder()); Another way of sorting ArrayList in Descending order is to sort the list in ascending order first and then it will be reversed. Collections.reverse() method will do reverse order of sorting In Java classes java.util.Date, java.util.Calendar, java.time.LocalDateTime, java.time.LocalDate and java.time.LocalTime implements comparable interface for natural ordering. Think this way , if you have to sort on multiple properties in same POJO java class for example on name in ascending and on age in descending etc. Basically, in Java 7, we were using Collections.sort() that was accepting a List and, eventually, a Comparator – in Java 8 we have the new List.sort(), which accepts a Comparator. sort employee object descending order using treeset in java Sort employee object in descending order using comparable and TreesSet - InstanceOfJava This is the java programming blog on "OOPS Concepts" , servlets jsp freshers and 1, 2,3 years expirieance java interview questions on java with explanation for interview examination . comparable<> Method to Sort Objects in ArrayList by Dates in Java The first method works by making the object comparable<> along with using classes compareTo (), compare () and collections.sort (). To do this we need to do 2 actions on our ArrayList i.e Reverse the ArrayList using Collections.reverseOrder() method And apply Collections.sort(List) on the List. This makes it a great candidate to use for sorting an array of objects. Contact | Notice that we're also using the new sort API added to java.util.List in Java 8 – instead of the old Collections.sort API. The sort method has excellent support across all browsers. Few examples to show you how to sort a List with stream.sorted(), 1.1 Sort a List with Comparator.naturalOrder(), 1.2 Sort a List with Comparator.reverseOrder(). Basically, in Java 7 we were using Collections.sort() that was accepting a List and, eventually, a Comparator - in Java 8 we have the new List.sort() that accepts a Comparator. How to sort stream in Java 8 Learn to sort stream of numbers and strings in ascending ( natural order ) and descending orders ( reverse order ) in Java 8 . In this article, we will discuss how to sort contents of ArrayList using sort() method of List in Java 8 . All the elements in the list must implement Comparable interface, otherwise IllegalArgumentException is thrown. To make it comparable, it implements the Comparable interface. Multiple properties use hashtables to sort in ascending order, descending order, or a combination of sort orders. ; Example: Calling the Collections.sort with only with one argument which is list, the list is sorted by default in ascending order. Collections.sort (List list); Collections.sort (List list); Collections.sort (List list); Collections.sort (List list); Collections.sort (List list); Problem occurred when date in String format and following different format pattern as MM/dd/yyyy ‘@’hh:mm a or some more patterns then you have to implement Comparator to sort this date … List < LocalDateTime > ldts = List.of( LocalDateTime.parse( "2016-10-06T09:10" ) , LocalDateTime.parse( "2016-10-06T10:34" ) , LocalDateTime.parse( "2016-12-06T11:15" ) , LocalDateTime.parse( "2016-11-06T10:34" ) , LocalDateTime.parse( "2016-12-06T10:10" ) , LocalDateTime.parse( "2016-12-06T06:56" ) ); List … In Java 8 sorting has been simplified by removing the verbose comparator code and anonymous inner classes. This method can sort a list in which all elements must implement the Comparable interface. This method returns a lexicographic-order comparator with another comparator. 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