Sort Java collection of ArrayList elements

1. New project, New Man class, add property

2. Right-click in the Code editing area, select source, automatically generate the Setter,getter method, and the constructor (similar to the operation, check generate constructor using field ... ）

3. Check the corresponding properties, confirm, very convenient.

Results such as:

The Man.java code is as follows:

1  Public classMan {2     3     PrivateString name;4      PublicString GetName () {5         returnname;6     }7      Public voidsetName (String name) {8          This. Name =name;9     }Ten      Public intgetheight () { One         returnheight; A     } -      Public voidSetHeight (intheight) { -          This. Height =height; the     } -     Private intheight; -      -      PublicMan (String name,intheight) { +         Super(); -          This. Name =name; +          This. Height =height; A     } at      -      -  -}

New Test.java

Add code:

Importjava.util.ArrayList; Public classTest { Public Static voidMain (string[] args) {ArrayList<Man> arr=NewArraylist<> ();//new dynamic linked list//Create 4 ObjectsMans man_exam1=NewMan ("Tall", 185); Mans Man_exam2=NewMan ("Middle child", 175); Mans MAN_EXAM3=NewMan ("Shorty", 165); Mans MAN_EXAM4=NewMan ("Tall", 195); //feel free to add to the dynamic arrayArr.add (MAN_EXAM1);        Arr.add (MAN_EXAM4);            Arr.add (MAN_EXAM3); //Print View         for(man Man:arr) {System.out.println (Man.getname ()+man.getheight ()); }                                                    }

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Run the output as follows:

Tall 185
Tall 195
Shorty 165

Can be seen in a disorderly order. Now sort it:

New class: Compare.java

Code:

1 ImportJava.util.Comparator;2 3  Public classCompareImplementscomparator{4 5       Public intCompare (Object Obj0, Object obj1) {6Mans s1=(man) obj0;7Mans s2=(man) obj1;8           9           if(S1.getheight () <=s2.getheight ())Ten                   return1; One                    A           return-1;  -      } -       the}

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Add the following code to the Test.java (the object is already stored in the dynamic array, arr, which is already sequenced after executing the following code):

Compare comparator=new Compare ();
Collections.sort (arr, comparator);

　　

Final full version Test.java code:

Importjava.util.ArrayList;Importjava.util.Collections; Public classTest { Public Static voidMain (string[] args) {ArrayList<Man> arr=NewArraylist<> ();//new dynamic linked list//Create 4 ObjectsMans man_exam1=NewMan ("Tall", 185); Mans Man_exam2=NewMan ("Middle child", 175); Mans MAN_EXAM3=NewMan ("Shorty", 165); Mans MAN_EXAM4=NewMan ("Tall", 195); //feel free to add to the dynamic arrayArr.add (MAN_EXAM1);        Arr.add (MAN_EXAM4);            Arr.add (MAN_EXAM3); //Print View         for(man Man:arr) {System.out.println (Man.getname ()+man.getheight ()); } System.out.println ("After sorting"); Compare Comparator=NewCompare ();               Collections.sort (arr, comparator);  for(intI=0;i<arr.size (); i++) {man user_temp=(man) arr.get (i); System.out.println (User_temp.getname ()+","+user_temp.getheight ()); }                                }}

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Project structure:

Sort Java collection of ArrayList elements