GCIntro.pdf

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Project Sun SPOT Overview
Introduction to
Gargbage Collection (GC)
Sang Shin
Technology Evangelist
Technology Evangelist
Sun Microsystems, Inc.
Sun Microsystems, Inc.
www.javapassion.com
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Introduction to
Gargbage Collection (GC)
Sang Shin
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Topics
• What is Garbage Collection (GC)?
• Why GC?
• When does GC occur?
• How does GC get performed?
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What is Garbage
Collection (GC)?
What is Garbage
Collection (GC)?
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What is GC?
• The Java virtual machine's heap stores all objects
created by a running Java application.
• Objects are created by the program through new
keyword, but never freed explicitly by the program
> No need to call free().
• Garbage collection is the process of automatically
freeing objects that are no longer needed
• An object is determined to be “no longer needed” when
there is no other object referencing to it
> Each object has a reference counter - when it becomes 0, it
means there is no other object referencing to it
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Why Garbage
Collection (GC)?
Why Garbage
Collection (GC)?
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