This class represents a Java package.
You can obtain the Package object for a given
Class by calling the getPackage(
) method of the Class object. The static
Package.getPackage( ) method returns a
Package object for the named package, if any such
package has been loaded by the current class loader. Similarly, the
static Package.getPackages( ) returns all
Package objects that have been loaded by the
current class loader. Note that a Package object
is not defined unless at least one class has been loaded from that
package. Although you can obtain the Package of a
given Class, you cannot obtain an array of
Class objects contained in a specified
Package.If the classes that comprise a package
are contained in a JAR file that has the appropriate attributes set
in its manifest file, the Package object allows
you to query the title, vendor, and
version of
both the package specification and the package implementation; all
six values are strings. The specification version string has a
special format. It consists of one or more integers, separated from
each other by periods. Each integer can have leading zeros, but is
not considered an octal digit. Increasing numbers indicate later
versions. The isCompatibleWith( ) method calls
getSpecificationVersion(
) to obtain the specification version and
compares it with the version string supplied as an argument. If the
package-specification version is the same as or greater than the
specified string, isCompatibleWith( ) returns
TRue. This allows you to test whether the version
of a package (typically a standard extension) is new enough for the
purposes of your application.
Packages may
be sealed, which means that all classes in the package must come from
the same JAR file. If a package is sealed, the no-argument version of
isSealed( ) returns true. The
one-argument version of isSealed( ) returns
TRue if the specified URL represents the JAR file
from which the package is loaded.
Figure 10-51. java.lang.Package
 public class Package implements java.lang.reflect.AnnotatedElement {
// No Constructor
// Public Class Methods
public static Package getPackage (String name );
public static Package[ ] getPackages ( );
// Public Instance Methods
public String getImplementationTitle ( );
public String getImplementationVendor ( );
public String getImplementationVersion ( );
public String getName ( );
public String getSpecificationTitle ( );
public String getSpecificationVendor ( );
public String getSpecificationVersion ( );
public boolean isCompatibleWith (String desired ) throws NumberFormatException;
public boolean isSealed ( );
public boolean isSealed (java.net.URL url );
// Methods Implementing AnnotatedElement
5.0 public <A extends java.lang.annotation.Annotation> A getAnnotation (Class<A>
annotationClass );
5.0 public java.lang.annotation.Annotation[ ] getAnnotations ( );
5.0 public java.lang.annotation.Annotation[ ] getDeclaredAnnotations ( );
5.0 public boolean isAnnotationPresent (Class<? extends java.lang.annotation.
Annotation> annotationClass );
// Public Methods Overriding Object
public int hashCode ( );
public String toString ( );
}
Returned By
Class.getPackage( ),
ClassLoader.{definePackage( ),
getPackage( ), getPackages( )},
java.net.URLClassLoader.definePackage( ) |
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