User.java

public class User {

  private int id;
  private String name;
  
  //setters & getters
  @Override
  public int hashcode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + id;
    result = prime * result + ((name == null) ? 0 : name.hashcode());
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    User user = (User)obj;
    if (id != user.id)
      return false;
    if (name == null) {
      if (user.name != null)
        return false;
    } else if (!name.equals(user.name)) {
      return false;
    return true;
  }

}