How to sort List Integer

Question

I have code and I have used list to store data  I want to sort data of it  then is there any way to sort data or shall I have to sort it manually by comparing all data   import java util ArrayList   import java util List   public class tes       public static void main String args                  List lt Integer gt  lList   new ArrayList lt Integer gt             lList add 4           lList add 1           lList add 7           lList add 2           lList add 9           lList add 1           lList add 5           for int i 0  i lt lList size   i                           System out println lList get i

User · Answer

You can use the utility method in Collections class public static  lt T extends Comparable lt   super T gt  gt  void sort List lt T gt  list   or   public static  lt T gt  void sort List lt T gt  list Comparator lt   super T gt  c    Refer to Comparable and Comparator interfaces for more flexibility on sorting the object

User · Answer

Use Collections class API to sort   Collections sort list

User · Answer

Just use Collections sort yourListHere  here to sort   You can read more about Collections from here

User · Answer

To sort in ascending order    Collections sort lList     And for reverse order    Collections reverse lList

User · Answer

You can use Collections for to sort data   import java util Collections  import java util ArrayList  import java util List   public class tes       public static void main String args                  List lt Integer gt  lList   new ArrayList lt Integer gt              lList add 4                  lList add 1           lList add 7           lList add 2           lList add 9           lList add 1           lList add 5            Collections sort lList            for int i 0  i lt lList size   i                           System out println lList get i

User · Answer

Ascending order    Collections sort lList      Descending order   Collections sort lList  Collections reverseOrder

User · Answer

You are using Lists  concrete ArrayList  ArrayList also implements Collection interface  Collection interface has sort method which is used to sort the elements present in the specified list of Collection in ascending order  This will be the quickest and possibly the best way for your case   Sorting a list in ascending order can be performed as default operation on this way   Collections sort list     Sorting a list in descending order can be performed on this way   Collections reverse list     According to these facts  your solution has to be written like this   public class tes        public static void main String args                  List lt Integer gt  lList   new ArrayList lt Integer gt             lList add 4           lList add 1           lList add 7           lList add 2           lList add 9           lList add 1           lList add 5            Collections sort lList           for int i 0  i lt lList size   i                           System out println lList get i                         More about Collections you can read here

[java] How to sort List<Integer>?

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