Win a copy of Node.js Design Patterns: Design and implement production-grade Node.js applications using proven patterns and techniques this week in the Server-Side JavaScript and NodeJS forum!
  • 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
  • Ron McLeod
  • Rob Spoor
  • Tim Cooke
  • Junilu Lacar
Sheriffs:
  • Henry Wong
  • Liutauras Vilda
  • Jeanne Boyarsky
Saloon Keepers:
  • Jesse Silverman
  • Tim Holloway
  • Stephan van Hulst
  • Tim Moores
  • Carey Brown
Bartenders:
  • Al Hobbs
  • Mikalai Zaikin
  • Piet Souris

Can Any Explain This Code...

 
Ranch Hand
Posts: 61
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
class SuperCafe4Java {
public Object get (Object o) {
return ("SuperCafe4Java");
}
}

class SubCafe4Java extends SuperCafe4Java {
public Object get (String o) {
return ("SubCafe4Java");
}
}

class TestCafe4Java {
public static void main (String[] arguments) {
SuperCafe4Java superFoo;
SubCafe4Java subFoo;

superFoo = new SubCafe4Java();
System.out.println (superFoo.get("super"));

subFoo = new SubCafe4Java();
superFoo = subFoo;
System.out.println (superFoo.get("super"));
}
}

OutPut:SuperCafe4Java
SuperCafe4Java
 
Sheriff
Posts: 9690
42
Android Google Web Toolkit Hibernate IntelliJ IDE Spring Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Well the output is

SuperCafe4Java
SuperCafe4Java

because get(Object o) is not overridden by get(String o). Instead the two methods are overloaded. So when you call get("super") with a SuperCafe4Java class reference, the compiler looks for a method matching get("super") in the SuperCafe4Java class. It finds the get(Object o) method matching this method (as get(String o) is not available in SuperCafe4Java). So that method is called.
 
Ranch Hand
Posts: 137
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Here get() method of SuperCafe4Java is overloaded in the sub class SubCafe4Java.
Its not overridden.(Overridden method calls will be determined at run time)
And the calls to the overloaded methods will be determined at compile time.

So the get method in SuperCafe4Java will be executed not the one in SubCafe4Java.

See page 109 of K&B 5.0 for more info!

Hope this is clear!
 
Thangaraj Selvamani
Ranch Hand
Posts: 61
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
But When Im Running This Two Code...Getting Different OutPut




 
M Srilatha
Ranch Hand
Posts: 137
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
 
Thangaraj Selvamani
Ranch Hand
Posts: 61
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Thank you...My Doubt Has got cleared...
 
reply
    Bookmark Topic Watch Topic
  • New Topic