Sort an ArrayList based on an object field

Question

Possible Duplicate    Sorting an ArrayList of Contacts       I am storing DataNode objects in an ArrayList  The DataNode class has an integer field called degree  I want to retrieve DataNode objects from nodeList in the increasing order of degree  How can I do it   List lt DataNode gt  nodeList   new ArrayList lt DataNode gt

User · Answer

Use a custom comparator   Collections sort nodeList  new Comparator lt DataNode gt          public int compare DataNode o1  DataNode o2            if o1 degree    o2 degree               return 0           return o1 degree  lt  o2 degree   -1   1

User · Answer

You can use the Bean Comparator to sort on any property in your custom class

User · Answer

Modify the DataNode class so that it implements Comparable interface   public int compareTo DataNode o         return degree - o degree       then just use  Collections sort nodeList

[java] Sort an ArrayList based on an object field

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