Java 對象頭 以 32 位虛擬機為例
普通對象
|--------------------------------------------------------------| | Object Header (64 bits) | |------------------------------------|-------------------------|
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Mark Word (32 bits)
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Klass Word (32 bits)
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一鍵獲取完整項目代碼
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java
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數組對象
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|---------------------------------------------------------------------------------| | Object Header (96 bits) | |--------------------------------|-----------------------|------------------------|
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Mark Word(32bits)
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Klass Word(32bits)
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array length(32bits)
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一鍵獲取完整項目代碼
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java
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其中 Mark Word 結構為
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|-------------------------------------------------------|--------------------|
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Mark Word (32 bits)
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State
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hashcode:25
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age:4
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-------------------------------------------------------
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--------------------
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thread:23
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epoch:2
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-------------------------------------------------------
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--------------------
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ptr_to_lock_record:30
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00
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-------------------------------------------------------
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--------------------
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ptr_to_heavyweight_monitor:30
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10
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-------------------------------------------------------
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--------------------
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11
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一鍵獲取完整項目代碼
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java
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64 位虛擬機 Mark Word
|--------------------------------------------------------------------|--------------------|
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Mark Word (64 bits)
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State
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unused:25
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hashcode:31
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--------------------------------------------------------------------
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--------------------
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thread:54
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epoch:2
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--------------------------------------------------------------------
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ptr_to_lock_record:62
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00
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--------------------------------------------------------------------
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--------------------
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ptr_to_heavyweight_monitor:62
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10
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--------------------------------------------------------------------
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11
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--------------------------------------------------------------------
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一鍵獲取完整項目代碼
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java
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———————————————— 版權聲明：本文為CSDN博主「向着五星的方向」的原創文章，遵循CC 4.0 BY-SA版權協議，轉載請附上原文出處鏈接及本聲明。 原文鏈接：https://blog.csdn.net/qq_69748833/article/details/136977618
