String is an immutable object.
Then how can the following code be justified.
String s1 = ?ABC?;
String s1 = s1+?XYZ?;
s.o.p(s1);
The output is ABCXYZ, which is the value of s1 ?
Answer Posted / amr
actually its a compiler error , variable already defined ..
but i'll answer the other part ,
String is immutable but does it make sense to write
String S1= abc;
S1=s1+"def";
YEAH its immutable and what happens behind the scene :
a new temporary String is created and using StringBuffer
which mutable class then appending then returning the
temporary string , thats the meaning of String is immutable
but StringBuffer is mutable , so if u r gonna use intensive
String manipulation u better go for StringBuffer because
String concatenation will result in more lines of code in
the byte code file generated when we compile .
this is a very frequent interview question .
Is This Answer Correct ? | 4 Yes | 0 No |
Post New Answer View All Answers
Which is better stringbuilder or stringbuffer?
Does printwriter create a file?
What is the syntax and characteristics of a lambda expression?
Can we declare the static variables and methods in an abstract class?
What is high level language in computer?
What is an immutable class? How to create an immutable class?
What are data types in programming?
Why is stringbuffer thread safe?
what is a green thread? : Java thread
What is an object class?
What are the differences between graph and tree?
What is the equal sign?
How can u increase the heap size in the memory?
What are different types of arrays?
What is boolean false?