Apr 27, 2013 · I have a List of doubles in java and I want to sort ArrayList in descending order. Input ArrayList is as below: List<Double> testList = new ArrayList (); testList.add (0.5); testList.add (0.2);

Aug 26, 2013 · How would your approach look like if I wanted to add multiple different sort options, for example Override the compareTo method to order by the object name, but add another one for sorting by age, product id etc. etc.

Also note that the default sort option is ascending, but you can set it to descending using: // e.g. Sort by points descending. Iteams.sort(Comparator.comparing(Team::getPoints).reversed()); That way, you can sort your ArrayList in different ways whenever you want, just by …

Apr 24, 2013 · I have an ArrayList of ArrayList of String. In Outer ArrayList on each index each Inner ArrayList has four items have four parameters. Contacts Id Contacts Name Contacts Adress Contacts Number Now I want to sort the complete ArrayList of the …

May 6, 2015 · I am looking to implement a sort feature for my address book application. I want to sort an ArrayList&lt;Contact&gt; contactArray. Contact is a class which contains four fields: name, home number,

Jul 24, 2017 · Could somebody show me a quick example how to sort an ArrayList alphabetically in Java 8 using the new lambda syntax.

Nov 23, 2012 · Your Contact class needs to implement the Comparable interface... Then you can use Collections.sort (list) to sort the list. Edit: If you want to have multiple ways of sorting, then you could also make a class that is implementing the Comparator interface. You can create multiple comparators (or make one configurable), then you can pass the comparator as second parameter to Collections.sort ...

Jul 26, 2014 · Im trying to figure out how to sort an ArrayList using comparable, my code looks like this: public class playerComparsion { public static void main (String [] args) { ArrayList<O...

JAVA 8 and Above Answer (Using Lambda Expressions) In Java 8, Lambda expressions were introduced to make this even easier! Instead of creating a Comparator () object with all of it's scaffolding, you can simplify it as follows: (Using your object as an example) Collections.sort(list, (ActiveAlarm a1, ActiveAlarm a2) -> a1.timeStarted-a2 ...

May 5, 2011 · You can also sort an ArrayList with a TreeSet instead of a comparator. Here's an example from a question I had before for an integer array. I'm using "numbers" as a placeholder name for the ArrayList.