public class User {

private String name;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

@Override
public Object getValue() {
    return getName();
}

@Override
public int hashCode() {
    return new HashCodeBuilder(3, 7)
            .append(name)
            .append(this.getClass())
            .toHashCode();
}

@Override
public boolean equals(Object obj) {
    if (obj == null || obj.getClass() != getClass()) {
        return false;
    }
    if (this == obj) {
        return true;
    }
    User other = (User) obj;
    return new EqualsBuilder()
            .append(name, other.name)
            .isEquals();
}
}

public static <T> Collection<T> sort(Collection<T> collection, Comparator<T> comp){
    List<T> list = new ArrayList<>(collection );

    Collections.sort(list, comp);

    return list;
}

public static final Comparator<User> DISPLAY_NAME_COMPARATOR = new Comparator<User>() {

    public int compare(User u1, User u2) {
        return u1.getName().compareTo(u2.getName());
    }
}