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When you say String is immutable, what do you mean by that?
Say I have String s = "Ness"
s= s+"Technologies";
What will happen? If the value gets appended, then what is
the meaning of immutable here?
- 5 Answers
- 17163 Views
- Ness Technologies, I also Faced
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Answers were Sorted based on User's Feedback
Answer / haribabu
Once you have assigned a value to a "String Object" (i am
saying an "object" not the "object reference")that value
can never change. This is immutability.
by defining "s = s+Technologies" we are pointing the
REFERENCE to newly created "string object" with the
modified string. So the previous string object is
considered to be lost.
This concept has explained very well in String, I/Os
chapter of Kethy Siera, SCJP 5.
All the best
| Is This Answer Correct ? | 26 Yes | 0 No |
Answer / harmetkrishanan
every time a new String object gets created in this case.
| Is This Answer Correct ? | 24 Yes | 5 No |
Answer / bln
Every time a new String objects gets created in this case,
but if assigned value is not same. If assigned, value is
same, then it points to same memory location, even if it is
another variable. For ex;
String s="Test";
String s2="Test";
Now s, s2 points to the same memory location.
| Is This Answer Correct ? | 20 Yes | 2 No |
Answer / r.jainrocks@gmail.com
When concatenation operator "+"
used with string
it always creates a new String object,
in String pool area.
| Is This Answer Correct ? | 11 Yes | 0 No |
Answer / anjani kumar jha
Now u add s= s+"Technologies";
so it will NessTechnologies because you append. and assign
new varible,means that new addition is assigned to s
take one example for more clarity
String x = "Java";
x.concat(" Rules!");
System.out.println(x);
output is x=java
because string is immutable.............think hard on it
Consider the following another example---------and think
about that
public class NewClass {
public static void main(String as[])
{
String s="abc";
String s1=s+"cde";
System.out.println(s);
System.out.println(s1);
String x = "Java";
x.concat(" Rules!");
System.out.println(x);
}
}
output is
s=abc;
s1=abcde
x=java
since u have added cde in s but still from the output it is
abc...............means string is immutable,
For more contact me
Anjani Kumar jha
09623154095
CDAC,PUNE
| Is This Answer Correct ? | 6 Yes | 4 No |
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