E and PI are not functions, they're static fields (data members). That code will output their values correctly. You don't have to import anything, the Math class is in the java.lang package, which is imported by default. More on stackoverflow.com

It's always legal to use the fullly qualified name of something instead of importing it in Java source code, like java.lang.System.out.println(libraries.standard.READ_LINE). JVM bytecode also does not have an "import" concept and always refers to things by their fully qualified names. If you'd like to compile to Java source code, you could first compile to an intermediate Java abstract syntax tree that always refers to things with their fully qualified names, then as one of the last operations iterate over the tree, hoisting as many names into import statements as you can. (Sortof the reverse operation of "name resolution" which is one of the first things a compiler does.) So basically this is a code formatting question. Note that Java source does not allow importing two things with the same name, so in some cases you won't be able to hoist all the imports. That's ok. More on reddit.com

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java.lang is always imported by default for Java.

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