Java Optional type example

OptionalUse.java

class MaybeBaby {
public final Optional<String> data;
public MaybeBaby(String data) {
this.data = Optional.of(data) ;
} 
public MaybeBaby() {
data = Optional.empty() ;
} 
public static main(String[] args) {
MaybeBaby no = new MaybeBaby() ;
MaybeBaby yes = new MaybeBaby("yes") ;

no.ifPresent(data -> System.out.println("will never run")) ;

// will print yes
yes.ifPresent(System.out::println) ;
} 
}