com.jn.langx.util.memory.objectsize

接口 MemoryLayoutSpecification

所有已知实现类:

Arch32MemoryLayoutSpecification, Arch64CompressedMemoryLayoutSpecified, Arch64UncompressedMemoryLayoutSpecification

public interface MemoryLayoutSpecification

Describes constant memory overheads for various constructs in a JVM implementation.

方法概要

限定符和类型	方法和说明
int	getArrayHeaderSize() Returns the fixed overhead of an array of any type or length in this JVM.
int	getObjectHeaderSize() Returns the fixed overhead of for any Object subclass in this JVM.
int	getObjectPadding() Returns the quantum field size for a field owned by an object in this JVM.
int	getReferenceSize() Returns the fixed size of an object reference in this JVM.
int	getSuperclassFieldPadding() Returns the quantum field size for a field owned by one of an object's ancestor superclasses in this JVM.

方法详细资料

getArrayHeaderSize

int getArrayHeaderSize()

Returns the fixed overhead of an array of any type or length in this JVM.

返回:

the fixed overhead of an array.

getObjectHeaderSize

int getObjectHeaderSize()

Returns the fixed overhead of for any Object subclass in this JVM.

返回:

the fixed overhead of any object.

getObjectPadding

int getObjectPadding()

Returns the quantum field size for a field owned by an object in this JVM.

返回:

the quantum field size for an object.

getReferenceSize

int getReferenceSize()

Returns the fixed size of an object reference in this JVM.

返回:

the size of all object references.

getSuperclassFieldPadding

int getSuperclassFieldPadding()

Returns the quantum field size for a field owned by one of an object's ancestor superclasses in this JVM.

返回:

the quantum field size for a superclass field.