package builder.pattern.demo;

public class User {
	private final String firstName;
	private final String lastName;
	private int age;
	private String phone;
	private String address;
	
	
	// pass the UserBuilder box into the User constructor
	private User(UserBuilder builder) {
		this.firstName = builder.firstName;
		this.lastName = builder.lastName;
		this.age = builder.age;
		this.phone = builder.phone;
		this.address = builder.address;
	}
	public String getFirstName() {
		return firstName;
	}
	public String getLastName() {
		return lastName;
	}
	public int getAge() {
		return age;
	}
	public String getPhone() {
		return phone;
	}
	public String getAddress() {
		return address;
	}
	
	
	// This is the box
	public static class UserBuilder {
		private final String firstName;
		private final String lastName;
		private int age = 0;;
		private String phone = "";
		private String address;
		
		public UserBuilder(String firstName, String lastName) {
			this.firstName = firstName;
			this.lastName = lastName;
		}
		// all the following methods are used to set values for optional fields
		public UserBuilder age(int age) {
			this.age = age;
			return this;
		}
		
		public UserBuilder phone(String phone) {
			this.phone = phone;
			return this;
		}
		
		public UserBuilder address(String address) {
			this.address = address;
			return this;
		}
		
		public User build() {
			return new User(this);
		}
	}
	
	public static void main(String[] args) {
		User user = new User.UserBuilder("Yixin", "Zhang")
							.age(100)
							.phone("123-456-7890")
							.address("Fake address")
							.build();
		System.out.println(user.getFirstName());
		System.out.println(user.getLastName());
		System.out.println(user.getAge());
		System.out.println(user.getPhone());
		System.out.println(user.getAddress());
	}
}