About Question enthuware.ocpjp.v8.2.1766 :

[sreeharshitha]

a Supplier interface takes no input but returns a value. In this, name::toUpperCase, will take name="bob" as input right?

[admin]

When we say that a functional interface takes no input, it actually means that the functional method of that functional interface takes no input.

So, no, there is no input to the toUpperCase method. It is invoked on the String reference. Think of it like this:

Code: Select all

String name = "bob";
Supplier<String> s = new Supplier(){
      String get(){
         return name.toUpperCase();
      }
  };

The above is what Supplier<String> s = name::toUpperCase; is translated into.

[thienday]

Hi admin, can you write a topic about the method reference in Java. When i have to face it i have some conclusion like this :
If it use the variable to get method like this example. When run time it compile to lambda like variable.method(name.toUpercase)
If it use the class and use the instance method like String::isEmpty. When run time it compile to lambda like parameter.method(s -> s.isEmpty())
If it use static method like Class::staticmethod When run time it compile to lambda like Class.staticmethod(parameter)

[yulinxp]

Check out here https://javadevcentral.com/java-method-references The best of best...