Java linear table sorting sample sharing _java

You can take a look at this static method public static <T> void sort (list<t> List, comparator< super t> C)

1. Define a model first:

Copy Code code as follows:

Package model;

/**
* User.java
*
* @author Beam WP March 3, 2014
*/
public class User
{
Private String UserName;
private int userage;

Public User ()
{
}

Public User (String userName, int userage)
{
This.username = UserName;
This.userage = Userage;
}

Public String GetUserName ()
{
return userName;
}

public void Setusername (String userName)
{
This.username = UserName;
}

public int Getuserage ()
{
return userage;
}

public void setuserage (int userage)
{
This.userage = Userage;
}
}

2. Then define a comparator, implement the Java.util.Comparator interface, and write a comparison rule in the Compare () method:

Copy Code code as follows:

Package util;

Import Java.util.Comparator;

Import model. User;

/**
* Comparatoruser.java
*
* @author Beam WP March 3, 2014
*/
public class Comparatoruser implements Comparator<user>
{
@Override
public int Compare (user arg0, user arg1)
{
Compare names first.
int flag = Arg0.getusername (). CompareTo (Arg1.getusername ());

If the name is the same, compare the age
if (flag = 0)
{
Return Arg0.getuserage ()-arg1.getuserage ();
}
return flag;
}
}

3. Sort by using java.util.Collections inside the sort (list list, Comparator C) method:

Copy Code code as follows:

Package test;

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

Import Util.comparatoruser;
Import model. User;

/**
* Testapp.java
*
* @author of the March 3, 2014
*/
public class TESTAPP
{
public static void Main (string[] arg0)
{
list<user> userlist = new arraylist<user> ();

Inserting data
Userlist.add (New User ("A", 15));
Userlist.add (New User ("B", 14));
Userlist.add (New User ("A", 14));

Sort
Collections.sort (userlist, New Comparatoruser ());

Print results
for (User u:userlist)
{
System.out.println (U.getusername () + "" + u.getuserage ());
}
}
}

4. Operation Result:

Copy Code code as follows:

A 14
A 15
B 14