var ArrayList = Java.type('java.util.ArrayList');
 var list = new ArrayList();
 list.add('a');
 list.add('b');
 list.add('c');

var ArrayList = Java.type('com.example.exa');

package de.lhorn.so;

public class Foo {

    public final static int ZERO = 0;

    public static int i() {
        return 1;
    }
}

$ javac de/lhorn/so/Foo.java
$ tree de
de
└── lhorn
    └── so
        ├── Foo.class
        └── Foo.java

% jrunscript -cp .
nashorn> var Foo = Java.type("de.lhorn.so.Foo")
nashorn> Foo.ZERO
0
nashorn> Foo.i
[jdk.internal.dynalink.beans.SimpleDynamicMethod int de.lhorn.so.Foo.i()]
nashorn> Foo.i()
1