@Exported public class VMOption extends Object
origin.
Each VM option has a default value. A VM option can be set at VM creation time typically as a command line argument to the launcher or an argument passed to the VM created using the JNI invocation interface. In addition, a VM option may be set via an environment variable or a configuration file. A VM option can also be set dynamically via a management interface after the VM was started. A VMOption contains the value of a VM option and the origin of that value at the time this VMOption object was constructed. The value of the VM option may be changed after the VMOption object was constructed,
| Modifier and Type | Class and Description |
|---|---|
static class |
VMOption.Origin
Origin of the value of a VM option.
|
| Constructor and Description |
|---|
VMOption(String name,
String value,
boolean writeable,
VMOption.Origin origin)
Constructs a VMOption.
|
| Modifier and Type | Method and Description |
|---|---|
static VMOption |
from(CompositeData cd)
Returns a VMOption object represented by the
given CompositeData.
|
String |
getName()
Returns the name of this VM option.
|
VMOption.Origin |
getOrigin()
Returns the origin of the value of this VM option.
|
String |
getValue()
Returns the value of this VM option at the time when
this VMOption was created.
|
boolean |
isWriteable()
Tests if this VM option is writeable.
|
String |
toString()
Returns a string representation of the object.
|
public VMOption(String name, String value, boolean writeable, VMOption.Origin origin)
name - Name of a VM option.value - Value of a VM option.writeable - true if a VM option can be set dynamically,
or false otherwise.origin - where the value of a VM option came from.NullPointerException - if the name or value is nullpublic String getName()
public String getValue()
public VMOption.Origin getOrigin()
public boolean isWriteable()
HotSpotDiagnosticMXBean.setVMOption method.public String toString()
java.lang.ObjecttoString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
public static VMOption from(CompositeData cd)
Attribute Name Type name java.lang.String value java.lang.String origin java.lang.String writeable java.lang.Boolean
cd - CompositeData representing a VMOptionIllegalArgumentException - if cd does not
represent a VMOption with the attributes described
above.
Copyright © 2003, 2018, Oracle and/or its affiliates. All rights reserved.