Ht-7 sorting custom objects in ArrayList

1  PackageCom.iotek.set;2 3 Importjava.util.ArrayList;4 Importjava.util.Collections;5 ImportJava.util.Comparator;6 Importjava.util.List;7 /**8  * 9 * Sort the contents of the ArrayList container: Store multiple Person objects (with Name,age,id properties) in ArrayListTen * required to sort by age from small to large, the same age and then sort the output in the natural order of the name One * Ideas: A * Use ArrayList to store the person object, using the static method sort provided by the collections class to - * ArrayList to sort, then output sorted information.  -  * @authorAdministrator the  * -  */ -  Public classCollectionsDemo2 { -     /*1. Create a ArrayList container + * 2. Create a person class with the Name,age,id property - * 3. Sort the data in the container, sort the implementation class of the list interface with the method of the collections class + * 4. Output sorted content*/ A      at      Public Static voidMain (string[] args) { -list<personc> data =NewArraylist<personc>(); -Data.add (NewPersonc ("Jack", 20,10)); -Data.add (NewPersonc ("Rose", 10,7)); -Data.add (NewPersonc ("Mary", 30,6)); -Data.add (NewPersonc ("Zhang", 50,18)); inData.add (NewPersonc ("Jay", 20,11)); -Collections.sort (data,NewComparator<personc>() { to @Override +              Public intCompare (Personc O1, Personc O2) { - //first sort by age. the                 if(O1.getage ()-o2.getage () > 0) { *                     return1; $}Else if(O1.getage ()-o2.getage () < 0) {Panax Notoginseng                     return-1; -}Else{//when the age is equal, it is sorted by name, the                     /*the specific string is an instantiated object of the string class, and you can invoke the String class's + * CompareTo (String anotherstring) method to sort strings in dictionary order A */                    returno1.getname (). CompareTo (O2.getname ()); the                 } +             } -         }); $          $          for(Personc p:data) { - System.out.println (p.tostring ()); -         } the     } - Wuyi } the /*Sort (list<t> list, comparator<? super t> C) Sorts the specified list according to the order produced by the specified comparer - * COMPARATOR< Super t> C C represents a comparer that can be implemented with anonymous inner classes Wu * The anonymous inner class produces an implementation class object of an interface, so implementing the Compare () method in this interface*/ - /*String.CompareTo (String anotherstring) compares two strings in dictionary order, returning a value of type int*/ About  $ classPersonc { -     PrivateString name; -     Private intAge ; -     Private intID; A      PublicPersonc (String name,intAgeintID) { +         Super(); the          This. Name =name; -          This. Age =Age ; $          This. ID =ID; the     } the      PublicString GetName () { the         returnname; the     } -      Public voidsetName (String name) { in          This. Name =name; the     } the      Public intGetage () { About         returnAge ; the     } the      Public voidSetage (intAge ) { the          This. Age =Age ; +     } -      Public intgetId () { the         returnID;Bayi     } the      Public voidSetId (intID) { the          This. ID =ID; -     } - @Override the     //override the ToString method to define the print format the      PublicString toString () { the         return"Person [name=" + name + ", age=" + Age + ", id=" + ID + "]"; the     } -      the}

Ht-7 sorting custom objects in ArrayList