import java.util.Optional;
public class App {
public static void main(String[] args) {
String[] str = new String[10];
str[5] = null;;
str[4] = "JAVA OPTIONAL CLASS EXAMPLE";
Optional<String> checkNull = Optional.ofNullable(str[5]);
if(checkNull.isPresent()){ // It Checks, value is present or not
String lowercaseString = str[5].toLowerCase();
System.out.print(lowercaseString);
}else
System.out.println("String value is not present");
}
}
Choose the correct output.
Compilation error
Runtime error: Null pointer Exception
Java optional example
String value is not present