Computer scienceProgramming languagesJavaCode organizationFunctional programmingFunctions

Optional

Theory

Create an Optional value

Report a typo

Implement the method getValue of the InputStringReader class. It should read a String value from the console and construct Optional<String> object based on the value. If an input String equals empty, then create an empty Optional.

Use java.util.Scanner to read input data.

Sample Input 1: 

abcd

Sample Output 1: 

Value is present: abcd

Sample Input 2: 

empty

Sample Output 2: 

Value is empty
Write a program in Java 17
import java.util.Optional;

class Main {
public static void main(String[] args) {
InputStringReader reader = new InputStringReader();
Optional<String> value = reader.getValue();
if (value.isPresent()) {
System.out.println("Value is present: " + value.get());
} else {
System.out.println("Value is empty");
}
}
}

class InputStringReader {
public Optional<String> getValue() {
// implement
}
}
___

Create a free account to access the full topic