Java object sorting

Object sorting is often encountered. For example, there is a person class whose instance objects are stored in the arraylist array.

Now, sort the person objects in the arraylist array by age.
In fact, this situation is often encountered.
The method is as follows:

1: person. Java file :-------------------------------
Public class person {
String name;
Int age;
 
Public Person (string name, int age ){
This. Name = Name;
This. Age = age;

}

Public int getage (){
Return age;
}

Public void setage (INT age ){
This. Age = age;
}

Public String getname (){
Return name;
}

Public void setname (string name ){
This. Name = Name;
}

}

2: mycomparator. Java -------------------------------
// Implement the comparator interface, that is, to define sorting rules. You can define almost any rule
Package com. infoearth;
Import java. util .*;
Public class mycomparator implements comparator {

Public int compare (Object O1, object O2 ){
Person p1 = (person) O1;
Person P2 = (person) O2;
If (p1.age <p2.age)
Return 1;
Else
Return 0;
}

}

3: listsort. Java ------------------------------------

Package com. infoearth;

Import java. util. arraylist;
Import java. util. collections;
Import java. util. comparator;

Public class listsort {
Public static void main (string [] ARGs ){
Arraylist list = new arraylist ();
List. Add (new person ("LCL", 28 ));
List. Add (new person ("FX", 23 ));
List. Add (new person ("wqx", 29 ));
Comparator comp = new mycomparator ();
Collections. Sort (list, comp );
For (INT I = 0; I <list. Size (); I ++ ){
Person P = (person) list. Get (I );
System. Out. println (P. getname ());
}

}

}