User.java

package com.hubshare.services.users;

public class User {

    private String login;

    private String firstname;

    private String lastname;

    private String encryptedPassword;

    private User(Builder builder) {
        login = builder.login;
        firstname = builder.firstname;
        lastname = builder.lastname;
        encryptedPassword = builder.encryptedPassword;
    }

    public static Builder newBuilder() {
        return new Builder();
    }

    public static Builder newBuilder(User copy) {
        Builder builder = new Builder();
        builder.login = copy.login;
        builder.firstname = copy.firstname;
        builder.lastname = copy.lastname;
        builder.encryptedPassword = copy.encryptedPassword;
        return builder;
    }

    public String login() {
        return login;
    }

    public String firstname() {
        return firstname;
    }

    public String lastname() {
        return lastname;
    }

    public String encryptedPassword() {
        return encryptedPassword;
    }

    public static final class Builder {
        private String login;
        private String firstname;
        private String lastname;
        private String encryptedPassword;

        private Builder() {
        }

        public Builder withLogin(String val) {
            login = val;
            return this;
        }

        public Builder withFirstname(String val) {
            firstname = val;
            return this;
        }

        public Builder withLastname(String val) {
            lastname = val;
            return this;
        }

        public Builder withEncryptedPassword(String val) {
            encryptedPassword = val;
            return this;
        }

        public User build() {
            return new User(this);
        }
    }
}

public Builder copy() {
    return newBuilder(this);
}