Oracle calling Java Resources

We can load various resources like jar,zip,text,imges using loadjava utility
 
loadjava -user userid/password HelloWorld.class
 
SELECT object_name, object_type, status
       FROM user_objects
       WHERE object_name LIKE '%Hello%';

create or replace function HELLO return VARCHAR2 as language java name 'Hello.world () return java.lang.String';

variable myString varchar2(20);
call HELLO2 into :myString;
 
select HELLO from dual;