nested class Danchisholm ques.

[cs singh]

class C {
  private static String s1 = "s1";
  String s2 = "s2";
  C() {m1("s5","s6");}
  void m1(final String s5, String s6) {
    final String s3 = "s3"; String s4 = "s4";
    class Z {Z() {System.out.print(???);}}
    new Z();
  }
  public static void main(String args[]) {new C();}
}
 
Which variable names can be substituted for ??? without causing a compile-time error? 
 
a.  s1 
b.  s2 
c.  s3 
d.  s4 
e.  s5 
f.  s6 
 

    

Answer is a, b, c, e.

i cant understand the answer.
Thanks,
Chani.

[marc weber]

Class Z is local to the method m1, and local classes can access local variables only if those variables are final. (See this thread for more details.)

In this case, local variables s5 and s3 are both final, although local variables s6 and s4 are not final.

s1 and s2 are instance variables of the enclosing class (not local to m1), so both of these can be accessed.

So the answer is s1, s2, s3, and s5.
[ February 09, 2006: Message edited by: marc weber ]