13.4.13
Method and Constructor Parameters
BINARY COMPATIBILITY
should have as much or more access if compatibility with pre existing binaries is
to be preserved.
13.4.13   Method and Constructor Parameters
Changing the name of a formal parameter of a method or constructor does not
impact pre existing binaries. Changing the name of a method, the type of a formal
parameter to a method or constructor, or adding a parameter to or deleting a
parameter from a method or constructor declaration creates a method or construc 
tor with a new signature, and has the combined effect of deleting the method or
constructor with the old signature and adding a method or constructor with the
new signature (see  13.4.12).
13.4.14   Method Result Type
Changing the result type of a method, replacing a result type with
void
, or replac 
ing
void
 with a result type has the combined effect of deleting the old method or
constructor and adding a new method or constructor with the new result type or
newly
void
 result (see  13.4.12).
13.4.15
abstract
Methods
Changing a method that is declared
abstract
 to no longer be declared
abstract
does not break compatibility with pre existing binaries.
Changing a method that is not declared
abstract
 to be declared
abstract
will break compatibility with pre existing binaries that previously invoked the
method, causing an
AbstractMethodError
. If the example program:
class Super { void out() { System.out.println("Out"); } }
class Test extends Super {
public static void main(String[] args) {
Test t = new Test();
System.out.println("Way ");
t.out();
}
}
is compiled and executed, it produces the output:
Way
Out
Suppose that a new version of class
Super
 is produced:
254






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