From Velmurugan's Mock Exam

[santhi Bendapudu]

Hi,
How many String objects are created when we run the following code.
String s1,s2,s3,s4;
s1 = "Hello";
s2 = s1;
s3 = s2 + "Pal";
s4 = s3;
Answer is 3
please explain
Thanking you,
Santhi

[Sivalingam Sivasuthan]

I think 3 String Objects.
s1 = "Hello"; --- 1
s2 = s1;
s3 = s2 + "Pal"; ---2
s4 = s3;
s3 = new StringBuffer().append(s2).append("pal").toString(); --- 3
Regards
Siva.

[This message has been edited by Sivalingam Sivasuthan (edited February 07, 2001).]

[Wong KK]

I think the three objects in the object heap are :
String s1,s2,s3,s4;
s1 = "Hello";
s2 = s1;----------------------------1
s3 = s2 + "Pal";--------------------2
s4 = s3;----------------------------3
From my understanding, there are only two conditions that an object will be pointed to the string pool
1. When we assigning a string literal to the String object
2. When we assigning String.valueOf(..) to the String object
Correct me if I am wrong.
KK.

[S Dave]

Pointing to objects in string pool and CREATING new objects is not the same.
3 new objects are created, thus, in these statements only:
s1 = "Hello"; //"Hello"
s3 = s2 + "Pal";//"Pal" and s2+"Pal"

[Anshuman Acharya]

this question has been discussed before. the string literal "pal" is created as a temporary object - like a transient.
if the question had asked how many objects are there at the end, the answer would have been 2.

[santhi Bendapudu]

Thanks to all for clearing things.

[Viral Thakkar]

Hello everybody..
now answer is 2 or 3..???

[Ivey Zhang]

It's 3.