How to Remove duplicates from ArrayList in Java

package com.test;

importjava.util.ArrayList;
importjava.util.LinkedHashSet;
importjava.util.List;
importjava.util.Set;

publicclassRemoveDuplicates {

publicstaticvoidmain(String[] args) {

            List<String> list = new ArrayList<String>();
            list.add("Mahesh");
            list.add("Nagesh");
            list.add("Lohit");
            list.add("Mahesh"); 
            System.out.println("List with duplicates:");
for (String name : list) {
                 System.out.println(name);
            }

/* Convert list to LinkedHashSet, to preserve the insertion 
              order and remove the duplicates */

            Set<String> set = new LinkedHashSet<String>(list);
            System.out.println("Set with unique elements:");
for (String name: set) {
                 System.out.println(name);
            }
      }
}

package com.test;

publicclassEmployee {

privateint empId;
private String empName;

publicEmployee(int empId, String empName) {
this.empId = empId;
this.empName = empName;
     }

publicintgetEmpId() {
return empId;
     }
publicvoidsetEmpId(int empId) {
this.empId = empId;
     }
public String getEmpName() {
return empName;
     }
publicvoidsetEmpName(String empName) {
this.empName = empName;
     }

@Override
publicinthashCode() {
returnthis.empId;
     }

@Override
publicbooleanequals(Object obj) {
if (obj instanceof Employee) {
return ((Employee)obj).empId == this.empId;
          }
returnfalse;
    }
}

package com.test;

importjava.util.ArrayList;
importjava.util.LinkedHashSet;
importjava.util.List;
importjava.util.Set;

publicclassRemoveCustomDuplicates {

publicstaticvoidmain(String[] args) {

            Employee emp1 = new Employee(1, "Kiran");
            Employee emp2 = new Employee(2, "Mahesh");
            Employee emp3 = new Employee(3, "Lakshmi");
            Employee emp4 = new Employee(1, "Kiran");

            List<Employee> list = new ArrayList<Employee>();

            list.add(emp1);
            list.add(emp2);
            list.add(emp3);
            list.add(emp4); 
            System.out.println("List with duplicates:");
for (Employee emp : list) {
                 System.out.println(emp.getEmpName());
            }

/* Convert list to LinkedHashSet, to preserve the insertion 
             order and remove the duplicates */

           Set<Employee> set = new LinkedHashSet<Employee>(list);
           System.out.println("Set with unique elements:");
for (Employee emp: set) {
                System.out.println(emp.getEmpName());
           }
      }

}