Question

I declared the following variable with the Optional<string> datatype which I had to do because of an Interface implementation

public Optional<String> value;

Now I need to write the below line of code which gives datatype mismatch error

value = input.readString();

Is there any way where I can type cast input.readString(); to datatype Optional<string>

Answer 1

You need to assign it as follows:

value = Optional.of(input.readString());

You do not cast to or from Optional. It is an entirely different type which has a generic type parameter.