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How Strings are immutable ?

 
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In the above code we are changing the state of String str1 object to upper case but immutable means we cannot change the state of the object then how is it possible..
 
Bartender
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You aren't changing the state, you're getting a new object.

Try this instead, and you'll see the difference.

 
siva chaitanya
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Thank you Matthew i got it String object state cannot be changed but StringBuffer object state can be changed means mutable
 
siva chaitanya
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And what is the difference between these two lines


Both are used to create objects of String?
 
Java Cowboy
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That last question has been asked before, last time was just a few days ago.
 
siva chaitanya
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Thank you jesper i got it
 
Marshal
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Don’t use StringBuffer for mutable Strings unless you need sunchronisation. Most of the time StringBuilder gives better performance.
 
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