Remove duplicate element in Arraylist using Comparator

package samset;

import java.util.ArrayList;

import java.util.Comparator;

import java.util.Set;

import java.util.TreeSet;

public class RemoveDuplicateElement {

public static void main(String[] args) {

final ArrayList emp = new ArrayList();

emp.add(new Employee("emp1", "001"));

emp.add(new Employee("emp2", "002"));

emp.add(new Employee("emp3", "003"));

emp.add(new Employee("emp4", "004"));

emp.add(new Employee("emp5", "001"));

emp.add(new Employee("emp6", "004"));

// Before using comprator

System.out.println(emp);

Set set = new TreeSet(new Comparator() {

@Override

public int compare(Employee o1, Employee o2) {

if(o1.getId().equalsIgnoreCase(o2.getId())){

        return 0;

        }

        return 1;

}

});

set.addAll(emp);

System.out.println(" After using comparator removing duplicates ");

    final ArrayList newList = new ArrayList(set);

    // Print original list 

System.out.println(newList);

}

}

class Employee {

private String name;

private String id;

public Employee(String name, String id) {

this.name = name;

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

@Override

public String toString() {

return "\n" +"Name=" + name + "   Id=" + id ;

}

}

Output :-

[

Name= Employee 1   Id=001, 

Name= Employee 2   Id=002, 

Name= Employee 3   Id=003, 

Name= Employee 4   Id=004, 

Name= Employee 5   Id=001, 

Name= Employee 6   Id=004]

<<<<< After using compartor >>>>>>

[

Name= Employee 1   Id=001, 

Name= Employee 2   Id=002, 

Name= Employee 3   Id=003, 

Name= Employee 4   Id=004]

Thank you