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Garbage Collection

 
Celso Serrano Araujo
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posted 20 years ago
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How many objects are elegible for GC once execution has rechead the line labeled LINE A?

String name;
String newName = "Nick";
newName = "Jason";
name= "Fried";
String newestName = name;
name = null;
//LINE A

a) 0
b) 1
c) 2
d) 3
e) 4

Answer b

This is right? why?
 
Mike Gershman
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posted 20 years ago
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When you get to LINE A:
newName refers to "Jason"
newestName refers to "Fried"
nothing refers to "Nick", so its eligible for garbage collection.

By the way, since "Nick" is in the String Literal Pool, which isn't garbage collected, the answer may be "a".

Mike Gershman
SCJP 1.4, SCWCD in process

 
Seema Manivannan
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posted 20 years ago
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Three String objects have been created here.
When line A is reached, the variable newName refers to String object "Jason", newestName refers to "Fried" and name refers to null. The object "Nick" has no variable referencing it. Hence only this object is eligible for GC.

Seema Manivannan<br />Author and Trainer: Java Certifications<br /> <br />Whizlabs Software<br />Success, certified!<br />Global leader: J2EE certification exam preparation!<br /><a href="http://www.whizlabs.com" target="_blank" rel="nofollow">http://www.whizlabs.com</a><br /> <br />An ISO 9001-2000 certified company!

 
Seema Manivannan
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posted 20 years ago
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Oops! I think we both replied around the same time :-)

Seema Manivannan<br />Author and Trainer: Java Certifications<br /> <br />Whizlabs Software<br />Success, certified!<br />Global leader: J2EE certification exam preparation!<br /><a href="http://www.whizlabs.com" target="_blank" rel="nofollow">http://www.whizlabs.com</a><br /> <br />An ISO 9001-2000 certified company!

 
Barry Gaunt
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posted 20 years ago
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Mike said: "By the way, since "Nick" is in the String Literal Pool, which isn't garbage collected, the answer may be "a"."

I'll bet my money on a for that reason.

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Fran Kindred
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Arent all string literals cannot be garbage collected since there will be a reference to the string literal pool.
 
Celso Serrano Araujo
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Is A or B right? the literal string could to be gabage collected?
 
Barry Gaunt
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String literals are not garbage collected.

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Getting someone to think and try something out is much more useful than just telling them the answer.

 
Fran Kindred
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I agree with the answer being A
 
Prashanth Raghavan
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I read from Ivor Horton that Since the string is in storage pool, this cannot be garbage collected and hence the answer must be 'a';

Prashanth R<br />Chennai

 
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