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uncaughtException(Thread, Throwable). Method in class java.lang.ThreadGroup

Called when a thread in this group exists because of an uncaught exception.

UndefinedProperty. Static variable in class java.awt.Image

The UndefinedProperty object should be returned whenever a property which was not defined for a particular image is fetched.

union(Rectangle). Method in class java.awt.Rectangle

Computes the union of two rectangles.

UnknownError(). Constructor for class java.lang.UnknownError

Constructs an UnknownError with no detail message.

UnknownError(String). Constructor for class java.lang.UnknownError

Constructs an UnknownError with the specified detail message.

UnknownHostException(). Constructor for class java.net.UnknownHostException

Constructs a new UnknownHostException with no detail message.

UnknownHostException(String). Constructor for class java.net.UnknownHostException

Constructs a new UnknownHostException with the specified detail message.

UnknownServiceException(). Constructor for class java.net.UnknownServiceException

Constructs a new UnknownServiceException with no detail message.

UnknownServiceException(String). Constructor for class java.net.UnknownServiceException

Constructs a new UnknownServiceException with the specified detail message.

unread(int). Method in class java.io.PushbackInputStream

Pushes back a character.

UnsatisfiedLinkError(). Constructor for class java.lang.UnsatisfiedLinkError

Constructs an UnsatisfiedLinkError with no detail message.

UnsatisfiedLinkError(String). Constructor for class java.lang.UnsatisfiedLinkError

Constructs an UnsatisfiedLinkError with the specified detail message.

UP. Static variable in class java.awt.Event

The up arrow key.

up(int). Method in class sun.tools.debug.RemoteThread

Change the current stackframe to be one or more frames higher (as in, away from the current program counter).

update(Graphics). Method in class java.awt.Component

Updates the component.

update(Observable, Object). Method in interface java.util.Observer

Called when observers in the observable list need to be updated.

url. Variable in class java.net.URLConnection

URL(String). Constructor for class java.net.URL

Creates a URL from the unparsed absolute URL.

URL(String, String, int, String). Constructor for class java.net.URL

Creates an absolute URL from the specified protocol, host, port and file.

URL(String, String, String). Constructor for class java.net.URL

Creates an absolute URL from the specified protocol, host, and file.

URL(URL, String). Constructor for class java.net.URL

Creates a URL from the unparsed URL in the specified context.If spec is an absolute URL it is used as is.

URLConnection(URL). Constructor for class java.net.URLConnection

Constructs a URL connection to the specified URL.

URLStreamHandler(). Constructor for class java.net.URLStreamHandler

useCaches. Variable in class java.net.URLConnection

UTC(int, int, int, int, int, int). Static method in class java.util.Date

Calculates a UTC value from YMDHMS.

UTFDataFormatException(). Constructor for class java.io.UTFDataFormatException

Constructs an UTFDataFormatException with no detail message.

UTFDataFormatException(String). Constructor for class java.io.UTFDataFormatException

Constructs an UTFDataFormatException with the specified detail message.