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garbage collection and String type
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Zeeman Chen
Greenhorn
Joined: Oct 30, 2003
Posts: 9
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I know String is a special type of object,
Can garbage collector effect on String?
thanks in advance.
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If a man take no thought at what is distant, he will find sorrow near at hand. ~ Confucius
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Joe Ess
Bartender
Joined: Oct 29, 2001
Posts: 8259
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Originally posted by zeeman chen:
I know String is a special type of object,
It is? How? It's declared final so it can't be extended, but that's it. I guess you can count the "+" operator as a special case. . .
Can garbage collector effect on String?
Yes.
[ November 25, 2003: Message edited by: Joe Ess ]
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"blabbing like a narcissistic fool with a superiority complex" ~ N.A.
[How To Ask Questions On JavaRanch]
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Peter Chase
Ranch Hand
Joined: Oct 30, 2001
Posts: 1970
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It is my understanding that literal String objects are a special case. There is a special pool of these in the JVM, without duplication. These will not get garbage-collected, I think.
However, other String objects, created in any other way (deserialised, created from char[], created by concatenation etc.) are eligible for garbage collection, like any other object. When no-one is referencing the String, it can be GC'd.
A further complication is that the actual array of characters used by a particular String object may be shared with other String objects. So, although a String may be eligible for GC, its character array may not. However, none of this is special "String magic"; you will often share objects between other objects in this way, yourself.
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subject: garbage collection and String type
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