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. (It's the only package imported by default, I believe.)
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. (It's the only package imported by default, I believe.)
You don't have to import anything here. The java.lang.Math class should already be available as java.lang package is imported by default
I had this line of code:
int generator = 1 + (int) (Math.random() * 19);
http://puu.sh/sGVps/b318650d6b.png
The program I create works perfectly but i was wondering why I didn't need to import lang.math despite using random.
would Math fall into this category?
Yes. It is documented as part of the JDK javadoc (since JDK 1.0) so you are guaranteed that it will exist in any JRE you'll ever encounter.
Note that since it resides in java.lang, you do not have to import it explicitly; you could:
import java.lang.Math;
but since all classes in java.lang are automatically imported (that includes String and Integer for instance), you need not do that.
This is a peculiar class in the sense that it cannot be instantiated and it only contains static methods and constants; apart from that you are sure to have it available, and that methods and constants obey the defined contract.
It comes with the SDK, if that is what "standard" meant.
It is part of the java.lang package, thus does not require import.