• 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
  • Tim Cooke
  • Devaka Cooray
  • Ron McLeod
  • Jeanne Boyarsky
Sheriffs:
  • Liutauras Vilda
  • paul wheaton
  • Junilu Lacar
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Piet Souris
  • Carey Brown
  • Tim Holloway
Bartenders:
  • Martijn Verburg
  • Frits Walraven
  • Himai Minh

Primitive Assignments

 
Greenhorn
Posts: 11
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Line 1 : byte a = 3;
Line 2 : a+= 7L;

The compiler automatically puts a cast in line 1. Will the second line run fine or will it require an explicit cast?
In case we require an explicit cast for long to byte (even though after the addition the value will easily fit into a byte), why don't we require an explicit cast in line 1 where also we are narrowing??

Please help me understand this.
 
Ranch Hand
Posts: 808
1
Android Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
byte a = 3;
a += 7L;

is equivalent to:
byte a = 3;
a += (byte)7L;

But:
byte a = 3;
a = a + 7L; //compiler error

+= operator makes implicit cast


 
Pooja Sinha
Greenhorn
Posts: 11
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
In that case,

Why does byte a = 3 work fine but not byte a = 7L?

Why does the compiler automatically casts the first expression and not the second?
 
Lucas Smith
Ranch Hand
Posts: 808
1
Android Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Look at the Java Language Specification - long has special treatment.
 
Ranch Hand
Posts: 196
Android Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Lukas Smith wrote:
+= operator makes implicit cast



Not only +=, all extended assignment operators put in an implicit cast..........
 
Lucas Smith
Ranch Hand
Posts: 808
1
Android Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
It's logical.
 
karthick chinnathambi
Ranch Hand
Posts: 196
Android Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator

Lukas Smith wrote:It's logical.


s my friend........

just wanted to mention that point.......
 
Sheriff
Posts: 9697
43
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

karthick chinnathambi wrote:
s my friend........



What's "s"?? is it yes?? if yes, then try to Use Real Words when you post anything...
 
I just had the craziest dream. This tiny ad was in it.
the value of filler advertising in 2021
https://coderanch.com/t/730886/filler-advertising
reply
    Bookmark Topic Watch Topic
  • New Topic