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Is there a reference page that lists all the standard property keys that are always accepted by the Java System.getProperty(key) method?
I am not referring to system properties that can be set by the user of the java command (this would be an unlimited list), but to the properties the runtime sets itself (such as java.version, java.specification.version, etc).
838
The getProperty(String key) method in Java is used to returns the system property denoted by the specified key passed as its argument.It is a method of the java. lang. System Class.
The getProperty method returns a string containing the value of the property. If the property does not exist, this version of getProperty returns null.
Programmatically, a system property can be set using the setProperty method of the System object, and also via the setProperty method of the Properties object that can be obtained from System via getProperties.
Java™ system properties determine the environment in which a Java program runs by starting a Java virtual machine with a set of values. You can choose to use the default values for Java system properties or you can specify values for them by adding parameters to the command line when you start your application.
System.getProperty () in Java. The getProperty (String key) method in Java is used to returns the system property denoted by the specified key passed as its argument.It is a method of the java.lang.System Class. Declaration − The java.lang.System.getProperty (String key) is declared as follows −. where key is the name of the System property.
The keys () method of Properties class is used to get the enumeration of the keys in this Properties object. This enumeration can be used to traverse and iterate the keys sequentially.
The System class has two methods used to read system properties: getProperty and getProperties. The System class has two different versions of getProperty. Both retrieve the value of the property named in the argument list.
For example, one such system property is “ java.version”=”1.7.0_09 “. Please note that access to system properties can be restricted by the Java security manager and policy file. By default, Java programs have unrestricted access to all the system properties.
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