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This is the minimized code to remove the duplicacy from Generic Type Data Class

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RemoveDuplicacy.java
Java
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package com;
 
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
 
public class Foo {
 
public static void main(String args[]) {
ArrayList<User> usersList = new ArrayList<User>();
usersList.clear();
 
User user = new User();
user.setName("A");
user.setId("1"); // duplicate
usersList.add(user);
 
user = new User();
user.setName("A");
user.setId("1"); // duplicate
usersList.add(user);
 
user = new User();
user.setName("AB");
user.setId("2"); // duplicate
usersList.add(user);
 
user = new User();
user.setName("C");
user.setId("4");
usersList.add(user);
 
user = new User();
user.setName("A");
user.setId("1"); // duplicate
usersList.add(user);
 
user = new User();
user.setName("A");
user.setId("2"); // duplicate
usersList.add(user);
 
Collection<User> userList = new HashSet<User>(usersList);
for (User userObject : userList) {
System.out.println(" Name :" + userObject.getName() + "\n Id :"
+ userObject.getId() + "\n");
 
}
 
 
}
 
}
 
class User {
private String name;
private String id;
/**
* @param name
* the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param id
* the id to set
*/
public void setId(String id) {
this.id = id;
}
/**
* @return the id
*/
public String getId() {
return id;
}
 
@Override
public int hashCode() {
 
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
 
}
 
@Override
public boolean equals(Object obj) {
 
if (this == obj)
return true;
 
if (obj == null)
return false;
 
if (getClass() != obj.getClass())
return false;
 
User other = (User) obj;
 
if (id == null) {
if (other.id != null)
return false;
 
} else if (!id.equals(other.id))
return false;
 
return true;
 
}
}

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