Java how to sort a Linked List

Question

I am needing to sort a linked list alphabetically  I have a Linked List full of passengers names and need the passengers name to be sorted alphabetically  How would one do this  Anyone have any references or videos

User · Answer

Elegant solution since JAVA 8   LinkedList lt String gt list   new LinkedList lt String gt     list add  abc    list add  Bcd    list add  aAb     list sort String  compareToIgnoreCase       Another option would be using lambda expressions   list sort  o1  o2  - gt  o1 compareToIgnoreCase o2

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If you d like to know how to sort a linked list without using standard Java libraries  I d suggest looking at different algorithms yourself   Examples here show how to implement an insertion sort  another StackOverflow post shows a merge sort  and ehow even gives some examples on how to create a custom compare function in case you want to further customize your sort

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In java8 you no longer need to use Collections sort method as LinkedList inherits the method sort from java util List  so adapting Fido s answer to Java8       LinkedList lt String gt list   new LinkedList lt String gt         list add  abc        list add  Bcd        list add  aAb         list sort  new Comparator lt String gt          Override         public int compare String o1 String o2               return Collator getInstance   compare o1 o2                       References    http   docs oracle com javase 8 docs api java util LinkedList html  http   docs oracle com javase 7 docs api java util List html

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Here is the example to sort implemented linked list in java without using any standard java libraries   package SelFrDemo   class NodeeSort       Object value      NodeeSort next       NodeeSort Object val            value   val          next   null              public Object getValue             return value             public void setValue Object value            this value   value             public NodeeSort getNext             return next             public void setNext NodeeSort next            this next   next            public class SortLinkList       NodeeSort head      int size   0       NodeeSort add Object val               TODO Auto-generated method stub         if  head    null                NodeeSort nodee   new NodeeSort val               head   nodee              size                return head                    NodeeSort temp   head           while  temp next    null                temp   temp next                     NodeeSort newNode   new NodeeSort val           temp setNext newNode           newNode setNext null           size            return head             NodeeSort sort NodeeSort nodeSort             for  int i   size - 1  i  gt   1  i--                NodeeSort finalval   nodeSort              NodeeSort tempNode   nodeSort               for  int j   0  j  lt  i  j                       int val1    int  nodeSort value                  NodeeSort nextnode   nodeSort next                  int val2    int  nextnode value                  if  val1  gt  val2                         if  nodeSort next next    null                            NodeeSort CurrentNext   nodeSort next next                          nextnode next   nodeSort                          nextnode next next   CurrentNext                          if  j    0                                finalval   nextnode                            else                             nodeSort   nextnode                           for  int l   1  l  lt  j  l                                  tempNode   tempNode next                                                     if  j    0                                tempNode next   nextnode                               nodeSort   tempNode                                                  else if  nodeSort next next    null                            nextnode next   nodeSort                          nextnode next next   null                          for  int l   1  l  lt  j  l                                  tempNode   tempNode next                                                    tempNode next   nextnode                          nextnode   tempNode                          nodeSort   tempNode                                            else                     nodeSort   tempNode                  nodeSort   finalval                  tempNode   nodeSort                  for  int k   0  k  lt   j  amp  amp  j  lt  i - 1  k                          nodeSort   nodeSort next                                                      return nodeSort              public static void main String   args            SortLinkList objsort   new SortLinkList            NodeeSort nl1   objsort add 9           NodeeSort nl2   objsort add 71           NodeeSort nl3   objsort add 6           NodeeSort nl4   objsort add 81           NodeeSort nl5   objsort add 2            NodeeSort NodeSort   nl5           NodeeSort finalsort   objsort sort NodeSort           while  finalsort    null                System out println finalsort getValue                 finalsort   finalsort getNext

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You can use Collections sort to sort things alphabetically

User · Answer

You can do it by Java 8 lambda expression    LinkedList lt String gt  list new LinkedList lt String gt     list add  bgh    list add  asd    list add  new      lambda expression list sort  a b - gt a compareTo b

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Node mergeSort Node head        if head    null    head next    null            return head             Node middle   middleElement head       Node nextofMiddle   middle next      middle next   null       Node left   mergeSort head       Node right   mergeSort nextofMiddle        Node sortdList   merge left  right        return sortdList     Node merge Node left  Node right        if left    null            return right             if right    null            return left            Node temp   null      if left data  lt  right data            temp   left          temp next   merge left next  right         else           temp   right          temp next   merge left  right next              return temp     Node middleElement Node head        Node slow   head      Node fast   head      while  fast    null  amp  amp  fast next    null  amp  amp  fast next next    null            fast   fast next next          slow   slow next            return slow

User · Answer

In order to sort Strings alphabetically you will need to use a Collator  like    LinkedList lt String gt  list   new LinkedList lt String gt      list add  abc     list add  Bcd     list add  aAb     Collections sort list  new Comparator lt String gt            Override      public int compare String o1  String o2             return Collator getInstance   compare o1  o2                 Because if you just call Collections sort list  you will have trouble with strings that contain uppercase characters   For instance in the code I pasted  after the sorting the list will be   aAb  abc  Bcd  but if you just call Collections sort list   you will get   Bcd  aAb  abc   Note  When using a Collator you can specify the locale Collator getInstance Locale ENGLISH  this is usually pretty handy

User · Answer

I wouldn t  I would use an ArrayList or a sorted collection with a Comparator  Sorting a LinkedList is about the most inefficient procedure I can think of

[java] Java how to sort a Linked List?

Elegant solution since JAVA 8:

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