String Objects - Count

[Ravi Bhatt]

All,

Can you please tell me how many string objects are created by below code?

1. String s= "Faltu";
2. s=s+"47";
3. s=s.substring(2,5);
4. s=s.toUpperCase();


As far as i know, it is 5. one point holding "Faltu", one holding "47" and rest 3 are created as a result of line 2,3,4.

But the answer is different in one of the mock tests that i took.

i tried this.

String s= "Faltu";
System.out.println(s.hashCode());
s=s+"47";
System.out.println(s.hashCode());
s=s.substring(2,5);
System.out.println(s.hashCode());
s=s.toUpperCase();
System.out.println(s.hashCode());

this code prints a different hashcode each time. confirming creation of new object.

Am i missing something? Please help. Thanks in advance.

[camilo lopes]

yes, to each creation of a new object jvm to give one hashcode different, when the implementation is on the part of it, has not to be that you programmer defines as must function hashcode for object X.

[Raghavan Muthu]

Perhaps this thread may help you.