learn java
The moose likes Programmer Certification (SCJP/OCPJP) and the fly likes String Question Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of The Software Craftsman this week in the Agile forum!
JavaRanch » Java Forums » Certification » Programmer Certification (SCJP/OCPJP)
Bookmark "String Question" Watch "String Question" New topic

String Question

Wai Iu
Ranch Hand

Joined: Apr 04, 2000
Posts: 39
I got the following question in one certification excercise:
public class test{
public static void amethod{
Byte b1 = new Byte("127");
if(b1.toString() == b1.toString())
Answer choice:
A) Compilation error, toString() is not avialable for Byte.
B) Prints "True".
C) Prints "False".
The correct answer is c)Prints "False". Please hekp me
understand why b1.toString() == b1.toString() is false?
Ranch Hand

Joined: Nov 22, 2008
Posts: 18944
In b1.toString() == b1.toString(), you are explicitly creating two new strings that are not on the string pool. Since they are different objects, the == fails.
Have you tried LearnNowOnline? http://www.learnnowonline.com/
subject: String Question