• 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
  • Paul Clapham
  • Tim Cooke
  • Jeanne Boyarsky
  • Liutauras Vilda
Sheriffs:
  • Frank Carver
  • Henry Wong
  • Ron McLeod
Saloon Keepers:
  • Tim Moores
  • Frits Walraven
  • Tim Holloway
  • Stephan van Hulst
  • Carey Brown
Bartenders:
  • Al Hobbs
  • Piet Souris
  • Himai Minh

output of the code

 
Greenhorn
Posts: 5
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
hello,
i have a code like this

Integer i1 = 128;
Integer i2 = 128;
System.out.println(i1 == i2);
Integer i3 = 127;
Integer i4 = 127;
System.out.println(i3 == i4);

The output of above code :
false
true

please tell me that how this output come as this.
 
Marshal
Posts: 76419
365
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Welcome to the Ranch

You appear to have arrived in the wrong forum, but don't worry; I can move your question.

Have a look at the documentation for the Integer#valueOf method, and the JLS (=Java┬« Language Specification) about boxing conversions. Look particularly at what it says about values ≥ −128 and ≤ 127. That should give you a hint why you are getting strange results from the == operator. Another reason not to use ==.
If you can't work out the problem from those resources, tell us, and we shall drop some more hints.
 
I was born with webbed fish toes. This tiny ad is my only friend:
Garden Master Course kickstarter
https://coderanch.com/t/754577/Garden-Master-kickstarter
reply
    Bookmark Topic Watch Topic
  • New Topic