Comparator Examples

package com.comparatorexample;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;

public class ComparatorMain {

 /**
  * @param args
  */
 public static void main(String[] args) {
  User user = new User();
  List userList = new ArrayList();
  user.setId(1);
  user.setName("Siva");
  user.setDob(new Date());
  user.setSal(20000);
  user.setCountry("India");
  user.setState("KA");
  userList.add(user);

  User user_1 = new User();

  user_1.setId(-10);
  user_1.setName("Kumar");
  user_1.setDob(new Date());
  user_1.setSal(20500);
  user_1.setCountry("India");
  user_1.setState("AP");
  userList.add(user_1);

  User user_2 = new User();

  user_2.setId(6);
  user_2.setName("Reddy");
  user_2.setDob(new Date());
  user_2.setSal(101010);
  user_2.setCountry("India");
  user_2.setState("TN");
  userList.add(user_2);

  // IdComparator class1 = new IdComparator();

  System.out
    .println("--------------------Before Sorting--------------------");
  System.out.println(userList);
  Collections.sort(userList, new UserSortById());
  System.out
    .println("--------------------After Sorting--------------------By ID");
  System.out.println(userList);

  Collections.sort(userList, new UserSortByName());
  System.out
    .println("--------------------After Sorting--------------------By Name");
  System.out.println(userList);

  Collections.sort(userList, new UserSortByDob());
  System.out
    .println("--------------------After Sorting--------------------By Date");
  System.out.println(userList);
  
  System.out
  .println("--------------------After Sorting--------------------By Salary");
  Collections.sort(userList);
  System.out.println(userList);
 }

}