[Java]Interface를 사용한 reflection 흉내내기

원본(Src) : http://stackoverflow.com/questions/1943021/equivalent-of-define-in-java


Depending on what you are doing (not quite enough information) you could do something like this:

interface Foo
{
void foo();
}

class FakeFoo
implements Foo
{
public void foo()
{
// do nothing
}
}

class RealFoo
{
public void foo()
{
// do something
}
}

and then provide a class to abstract the instantiation:

class FooFactory
{
public static Foo makeFoo()
{
final String name;
final FooClass fooClass;
final Foo foo;

name = System.getProperty("foo.class");
fooClass = Class.forName(name);
foo = (Foo)fooClass.newInstance();

return (foo);
}
}

Then run java with -Dfoo.name=RealFoo|FakeFoo

Ignored the exception handling in the makeFoo method and you can do it other ways... but the idea is the same.

That way you compile both versions of the Foo subclasses and let the developer choose at runtime which they wish to use.