OnJava8-Examples/reflection/Person.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// reflection/Person.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Using Optional with regular classes

import onjava.*;

import java.util.*;

class Person {

public final Optional<String> first;

public final Optional<String> last;

public final Optional<String> address;

// etc.

public final boolean empty;

Person(String first, String last, String address) {

this.first = Optional.ofNullable(first);

this.last = Optional.ofNullable(last);

this.address = Optional.ofNullable(address);

empty = !this.first.isPresent()

&& !this.last.isPresent()

&& !this.address.isPresent();

}

Person(String first, String last) {

this(first, last, null);

}

Person(String last) { this(null, last, null); }

Person() { this(null, null, null); }

@Override public String toString() {

if(empty)

return "<Empty>";

return (first.orElse("") +

" " + last.orElse("") +

" " + address.orElse("")).trim();

}

public static void main(String[] args) {

System.out.println(new Person());

System.out.println(new Person("Smith"));

System.out.println(new Person("Bob", "Smith"));

System.out.println(new Person("Bob", "Smith",

"11 Degree Lane, Frostbite Falls, MN"));

}

/* Output:

<Empty>

Smith

Bob Smith

Bob Smith 11 Degree Lane, Frostbite Falls, MN

OnJava8-Examples/reflection/Person.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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