Win a copy of Microservices in Action this week in the Web Services 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 all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Bear Bibeault
  • Devaka Cooray
  • Liutauras Vilda
  • Jeanne Boyarsky
Sheriffs:
  • Knute Snortum
  • Junilu Lacar
  • paul wheaton
Saloon Keepers:
  • Ganesh Patekar
  • Frits Walraven
  • Tim Moores
  • Ron McLeod
  • Carey Brown
Bartenders:
  • Stephan van Hulst
  • salvin francis
  • Tim Holloway

anglefire.com question  RSS feed

 
Ranch Hand
Posts: 486
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Read the following code excerpt carefully. //Contents of file A.java public


Which of the following are true
1.A.java cannot be compiled. Duplicate defination of inner class B.
2.A.java compiles without any error. An attempt to run C as an application will cause runtime linkage error. Duplicate definations of inner class B are found
3.Only one class file corresponding to the inner class B is created in the file system.
4.Two class files corresponding to both inner classes (B) is created in the file system.
5.The classes compile cleanly and on running C as an application causes "I am in the arg constructor" to be printed on the console
Answer are 4 and 5.

6.My question is when I run the program in the command line and listed how many class files are there? to get the answer 4.I got only one class file created.But here,how come the answer �Two class files corresponding to both inner classes (B) is created in the file system.�-is coming?Can anyone please explain?
 
Ranch Hand
Posts: 317
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
the inner "B" classes. Ok You have defined one B class definition. the sections of code



and


are anonymous inner classes that extend from B.

Read inner classes from thinking in java.
 
Ranch Hand
Posts: 7729
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Please can you tell us the exact url to these angelfire.com questions?
 
Shiva Mohan
Ranch Hand
Posts: 486
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I am sorry to get back this late.
The exact URL is
http://www.angelfire.com/or/abhilash/Main.html

Over there,we can find 9 quizes.
 
Ranch Hand
Posts: 1249
Java Spring Ubuntu
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator


Then you will get output as

"I am in the arg constructor"

and if we are using class C as follows:



this time no output is coming instead of
"I am in no-arg constructor"

Why this is coming so???
Should we discuss this in same thread or should we start a new thread...
??
[ July 25, 2006: Message edited by: Ankur Sharma ]
 
Ranch Hand
Posts: 107
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Because the no-arg constructor of class A doesnot create any instance of inner class B.
 
Barry Gaunt
Ranch Hand
Posts: 7729
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Because the printing of the "I am in the (no)-arg constructors" messages are not in the (no)-arg constructors! They are in instance initialization blocks of the constructors' local inner classes.

I was going to edit this to add what Neelish wrote, but I need not bother now.
[ July 25, 2006: Message edited by: Barry Gaunt ]
 
Shaan Shar
Ranch Hand
Posts: 1249
Java Spring Ubuntu
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

Originally posted by Barry Gaunt:
Because the printing of the "I am in the (no)-arg constructors" messages are not in the no-arg constructors! They are in instance initialization blocks of the constructors' local inner classes.



Oops...... I missed this line...






Well Thankx for reminding this line...
 
It is sorta covered in the JavaRanch Style Guide.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!