Java Reference
In-Depth Information
public static Properties
getProperties()
Gets the
Properties
object that defines all system properties.
public static String
getProperty(String key)
Returns the value of the system property named in
key
.
public static String
getProperty(String key, String defaultValue)
Returns the value of the system property named in
key
. If it
has no definition, it returns
defaultValue
.
public static String
setProperty(String key, String value)
Sets the value of the system property named in
key
to the giv-
en
value
, returning the previous value or
null
if the property
was not previously set.
public static String
clearProperty(String key)
Removes the system property named in
key
, returning the
previous value, or
null
if the property was not previously set.
public static void
setProperties(Properties props)
Sets the
Properties
object that defines all system properties
to be
props
.
All these methods are security checked and may throw
SecurityExcep-
tion
. However, being denied access to the entire set of properties does
not necessarily mean you will be denied access to individual properties.
Property values are stored as strings, but the strings can represent oth-
er types, such as integers or booleans. Methods are available to read
properties and decode them into some of the primitive types. These de-
coding methods are static methods of the primitive type's class. Each
