ArrayList container sorting Comparator interface and comparable interface use __java

1, the entity class implements the comparable interface, the rewriting CompareTo method

Package io;
Import Java.text.DateFormat;
Import java.text.ParseException;
Import Java.text.SimpleDateFormat;

Import Java.util.Date;
	public class Student implements comparable<student>{private String name;
	private int age;
	
	
	
	Private Date birthday;
		Public Student (string name, int age, string birthday) {super ();
		THIS.name = name;
		
		This.age = age;
		DateFormat ds=new SimpleDateFormat ("Yyyy-mm-dd");
		try {this.birthday = Ds.parse (birthday);
		catch (ParseException e) {e.printstacktrace ();
	};
	Public String GetName () {return name;
	public void SetName (String name) {this.name = name;
	public int getage () {return age;
	public void Setage (int age) {this.age = age;
	Public Date Getbirthday () {return birthday;
	The public void Setbirthday (Date birthday) {this.birthday = birthday;
		///Descending by name in ascending birthday @Override public int compareTo (Student o) {int result=0;
		Result=-this.name.compareto (O.name); if (result==0) {RESult=this.birthday.compareto (O.birthday);
	return result; @Override public String toString () {return "Student [name=] + name +", age= + age +, birthday= "+ Birthday +
	"]";
 }
	

}

Package io;

Import java.util.ArrayList;
Import java.util.Collections;
Import java.util.List;

public class App. {public

	static void Main (string[] args) {
		
		list<student> list=new arraylist<student > ();
		List.add (New Student ("John", "1987-10-5"));
		List.add (New Student ("Harry", "1986-10-5"));
		List.add (New Student ("Zhao Liu", "1988-10-5"));
		List.add (New Student ("Wang Qi", "1980-10-5"));
		Collections.sort (list);
		for (Student s:list) {
			System.out.println (s);
		}
	}
}

2, create a new business class implementation comparator interface, rewrite the Compare method.

package io;
Import Java.text.DateFormat;
Import java.text.ParseException;
Import Java.text.SimpleDateFormat;

Import Java.util.Date;
	public class Student {private String name;
	private int age;
	
	
	
	Private Date birthday;
		Public Student (string name, int age, string birthday) {super ();
		THIS.name = name;
		
		This.age = age;
		DateFormat ds=new SimpleDateFormat ("Yyyy-mm-dd");
		try {this.birthday = Ds.parse (birthday);
		catch (ParseException e) {e.printstacktrace ();
	};
	Public String GetName () {return name;
	public void SetName (String name) {this.name = name;
	public int getage () {return age;
	public void Setage (int age) {this.age = age;
	Public Date Getbirthday () {return birthday;
	The public void Setbirthday (Date birthday) {this.birthday = birthday; @Override public String toString () {return "Student [name=] + name +", age= + age +, birthday= "+ Birthday
	+ "]"; }
	

}

Package io;

Import Java.util.Comparator;

The public class Birthdaycomp implements comparator<student>{


	@Override
	the public int compare (Student O1, Student O2) {return
	
		o1.getbirthday (). CompareTo (O2.getbirthday ());
	}

}

Package io;

Import java.util.ArrayList;
Import java.util.Collections;
Import java.util.List;

public class App. {public

	static void Main (string[] args) {
		
		list<student> list=new arraylist<student& gt; ();
		List.add (New Student ("John", "1987-10-5"));
		List.add (New Student ("Harry", "1986-10-5"));
		List.add (New Student ("Zhao Liu", "1988-10-5"));
		List.add (New Student ("Wang Qi", "1980-10-5"));
		Collections.sort (list, new Birthdaycomp ());
		for (Student s:list) {
			System.out.println (s);
		}
	}
}