• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

out put of class

 
Anonymous
Ranch Hand
Posts: 18944
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
can any body explain the out put as iam getting answer 2 ;
* but answer is 1;
public class Poly
{
public static void main(String argc[])
{
A ref1=new C();
B ref2=(B)ref1;
System.out.println(ref2.g());
}
}
class A
{
private int f() {return 0; }
public int g() {return 3; }
}
class B exends A {
private int f() { return 1;}
public int g() { return f(); }
}
class C extends B {
public int f() { return 2; }
}
 
Carl Trusiak
Sheriff
Posts: 3341
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Originally posted by gouru:
can any body explain the out put as iam getting answer 2 ;
* but answer is 1;
public class Poly
{
public static void main(String argc[])
{
A ref1=new C();
B ref2=(B)ref1;
System.out.println(ref2.g());
}
}
class A
{
private int f() {return 0; }
public int g() {return 3; }
}
class B extends A {
private int f() { return 1;}
public int g() { return f(); }
}
class C extends B {
public int f() { return 2; }
}


I am using jdk1.2.2 and when this is ran, I get an output of 1. I thought the method that was chosen was based on the actual object? Could this result be because a B method made the call, it's method was chosen?
 
Anonymous
Ranch Hand
Posts: 18944
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hi
the basic thing is that in method g() u r calling a private method f(). Remember that private methods are not overriden. thus class C method f() is not called.
if u change the B.f() method to public, protected, or default u will get the result that u expect.
if u have problems do tell me.
regds
Rahul.

[This message has been edited by rahul_mkar (edited June 21, 2000).]
 
Don't get me started about those stupid light bulbs.
reply
    Bookmark Topic Watch Topic
  • New Topic