java-ee - java编程思想15章 366页 关于泛型的问题？

Answer 1

If you look carefully at the import of the code in the book, there is a line that says import static ... - This can be used to import static elements of a class, including static methods.

Answer 2

Pay attention to the importsentences

import static net.mindview.util.Tuple.*;

Answer 3

Look at the second lineimport static net.mindview.util.Tuple.*