When you implement an interface method (by overriding the interface’s method header), remember that all of the methods whose headers are declared in the interface are implicitly declared public.

See the Java 101 Java interfaces tutorial for a more in-depth introduction to using interfaces in your Java programs, including where and where not to use default, static, and private methods.

That’s all you really need to know about the java.util.function.Function interface. It is a very simple component that simply requires the implementation of one method — named apply — that is passed ...

Java Supplier interface tutorial. As you can see, the code for the class that implements Java’s Supplier interface is fairly simple. The only requirements are the class declaration and the ...