How to use String methods on java.util.stream.Stream lines

Question

I'd like to use the Stream API to compact some existing functions I have. I have a doubt on how to call functions on the lines I'm streaming. For example, take the following snippet:

String str = "abcdef"; 
Stream<String> lines = str.lines();
lines.forEach(System.out::println);

Is it possible to invoke String methods on each line? for example, instead of just printing the raw line, I want to print the toUpperCase() of it. So that the output is:

ABCDEF

Is there a way to plug the toUpperCase() function in this line:

lines.forEach(System.out::println);

Answer 1

Sure.

lines.forEach(line -> System.out.println(line.toUpperCase());

or

lines.map(String::toUpperCase).forEach(System.out::println);