[883] in java-interest
Re: mutual dependencies among public classes
daemon@ATHENA.MIT.EDU (Doug Lea)
Sun Aug 13 11:49:26 1995
Date: Sun, 13 Aug 1995 07:09:03 -0400
From: Doug Lea <dl@altair.cs.oswego.edu>
To: jpayne@starwave.com
CC: econsoft@wintermute.co.uk, java-interest@java.sun.com
In-reply-to: <9508111556.AA19466@flim.starwave.com> (jpayne@starwave.com)
> This statement is incorrect, unless I am confused. You can have
> classes referring to each other, left and right, and it just works.
> They don't have to be in the same file or package. The compiler just
> has to be able to find the other classes, which is why there is the
> convention that classes (public ones, anyway) are in files that match
> their class names.
Indeed it does just work. Sorry for the confusion.
Hoping to counteract my previous misinformation, here's a successful
example. All of the right .class files are generated, without errors
or warnings when you place all of the following files in a
subdirectory/package `t813', and then compile with `javac
Tester.java'. (The use of a package here was just to verify that only
those files/.classes listed here were being used. The use of
interfaces was just to show that it works for interfaces as well.)
-- file InterfaceA.java:
package t813;
public interface InterfaceA {
public void a1(InterfaceB b);
}
-- file InterfaceA.java:
package t813;
public interface InterfaceB {
public void b1(InterfaceA a);
}
-- file ClassA.java:
package t813;
public class ClassA implements InterfaceA {
public void a1(InterfaceB b) { System.out.println("a1"); }
}
-- file ClassB.java:
package t813;
public class ClassB implements InterfaceB {
public void b1(InterfaceA a) { a.a1(this); }
}
-- file Tester.java
package t813;
public class Tester {
static public void main(String args[]) {
ClassA a = new ClassA();
ClassB b = new ClassB();
a.a1(b);
b.b1(a);
}
}
--
Doug Lea | dl@cs.oswego.edu | dl@cat.syr.edu | 315-341-2688 | FAX 315-341-5424
Computer Science Dept, SUNY Oswego, Oswego, NY 13126 | http://g.oswego.edu/dl/
Also: Software Eng. Lab, NY CASE Center, Syracuse Univ, Syracuse NY 13244
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