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## U

UK - Static variable in class java.util.Locale
  Useful constant for country.
UNASSIGNED - Static variable in class java.lang.Character
  Public data for enumerated Unicode general category types.
uncaughtException(Thread, Throwable) - Method in class java.lang.ThreadGroup
  Called by the Java Virtual Machine when a thread in this thread group stops because of an uncaught exception.
UNDECIMBER - Static variable in class java.util.Calendar
  Value of the `MONTH` field indicating the thirteenth month of the year.
UndeclaredThrowableException - exception java.lang.reflect.UndeclaredThrowableException.
  Thrown by a method invocation on a proxy instance if its invocation handler's `invoke` method throws a checked exception (a `Throwable` that is not assignable to `RuntimeException` or `Error`) that is not assignable to any of the exception types declared in the `throws` clause of the method that was invoked on the proxy instance and dispatched to the invocation handler.
UndeclaredThrowableException(Throwable) - Constructor for class java.lang.reflect.UndeclaredThrowableException
  Constructs an `UndeclaredThrowableException` with the specifed `Throwable`.
UndeclaredThrowableException(Throwable, String) - Constructor for class java.lang.reflect.UndeclaredThrowableException
  Constructs an `UndeclaredThrowableException` with the specified `Throwable` and a detail message.
UNINITIALIZED - Static variable in class java.security.Signature
  Possible `Signature.state` value, signifying that this signature object has not yet been initialized.
UnknownHostException - exception java.net.UnknownHostException.
  Thrown to indicate that the IP address of a host could not be determined.
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 - exception java.net.UnknownServiceException.
  Thrown to indicate that an unknown service exception has occurred.
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.
unmodifiableCollection(Collection) - Static method in class java.util.Collections
  Returns an unmodifiable view of the specified collection.
unmodifiableList(List) - Static method in class java.util.Collections
  Returns an unmodifiable view of the specified list.
unmodifiableMap(Map) - Static method in class java.util.Collections
  Returns an unmodifiable view of the specified map.
unmodifiableSet(Set) - Static method in class java.util.Collections
  Returns an unmodifiable view of the specified set.
unmodifiableSortedMap(SortedMap) - Static method in class java.util.Collections
  Returns an unmodifiable view of the specified sorted map.
unmodifiableSortedSet(SortedSet) - Static method in class java.util.Collections
  Returns an unmodifiable view of the specified sorted set.
unread(byte[]) - Method in class java.io.PushbackInputStream
  Pushes back an array of bytes by copying it to the front of the pushback buffer.
unread(byte[], int, int) - Method in class java.io.PushbackInputStream
  Pushes back a portion of an array of bytes by copying it to the front of the pushback buffer.
unread(char[]) - Method in class java.io.PushbackReader
  Push back an array of characters by copying it to the front of the pushback buffer.
unread(char[], int, int) - Method in class java.io.PushbackReader
  Push back a portion of an array of characters by copying it to the front of the pushback buffer.
unread(int) - Method in class java.io.PushbackReader
  Push back a single character.
unread(int) - Method in class java.io.PushbackInputStream
  Pushes back a byte by copying it to the front of the pushback buffer.
UnrecoverableKeyException - exception java.security.UnrecoverableKeyException.
  This exception is thrown if a key in the keystore cannot be recovered.
UnrecoverableKeyException() - Constructor for class java.security.UnrecoverableKeyException
  Constructs an UnrecoverableKeyException with no detail message.
UnrecoverableKeyException(String) - Constructor for class java.security.UnrecoverableKeyException
  Constructs an UnrecoverableKeyException with the specified detail message, which provides more information about why this exception has been thrown.
UnresolvedPermission - class java.security.UnresolvedPermission.
  The UnresolvedPermission class is used to hold Permissions that were "unresolved" when the Policy was initialized.
UnresolvedPermission(String, String, String, Certificate[]) - Constructor for class java.security.UnresolvedPermission
  Creates a new UnresolvedPermission containing the permission information needed later to actually create a Permission of the specified class, when the permission is resolved.
UnsatisfiedLinkError - error java.lang.UnsatisfiedLinkError.
  Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared `native`.
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.
UnsupportedClassVersionError - error java.lang.UnsupportedClassVersionError.
  Thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.
UnsupportedClassVersionError() - Constructor for class java.lang.UnsupportedClassVersionError
  Constructs a `UnsupportedClassVersionError` with no detail message.
UnsupportedClassVersionError(String) - Constructor for class java.lang.UnsupportedClassVersionError
  Constructs a `UnsupportedClassVersionError` with the specified detail message.
UnsupportedEncodingException - exception java.io.UnsupportedEncodingException.
  The Character Encoding is not supported.
UnsupportedEncodingException() - Constructor for class java.io.UnsupportedEncodingException
  Constructs an UnsupportedEncodingException without a detail message.
UnsupportedEncodingException(String) - Constructor for class java.io.UnsupportedEncodingException
  Constructs an UnsupportedEncodingException with a detail message.
UnsupportedOperationException - exception java.lang.UnsupportedOperationException.
  Thrown to indicate that the requested operation is not supported.
UnsupportedOperationException() - Constructor for class java.lang.UnsupportedOperationException
  Constructs an UnsupportedOperationException with no detail message.
UnsupportedOperationException(String) - Constructor for class java.lang.UnsupportedOperationException
  Constructs an UnsupportedOperationException with the specified detail message.
update(byte) - Method in class java.security.MessageDigest
  Updates the digest using the specified byte.
update(byte) - Method in class java.security.Signature
  Updates the data to be signed or verified by a byte.
update(byte[]) - Method in class java.security.MessageDigest
  Updates the digest using the specified array of bytes.
update(byte[]) - Method in class java.security.Signature
  Updates the data to be signed or verified, using the specified array of bytes.
update(byte[]) - Method in class java.util.zip.CRC32
  Updates checksum with specified array of bytes.
update(byte[]) - Method in class java.util.zip.Adler32
  Updates checksum with specified array of bytes.
update(byte[], int, int) - Method in class java.security.MessageDigest
  Updates the digest using the specified array of bytes, starting at the specified offset.
update(byte[], int, int) - Method in class java.security.Signature
  Updates the data to be signed or verified, using the specified array of bytes, starting at the specified offset.
update(byte[], int, int) - Method in class java.util.zip.CRC32
  Updates CRC-32 with specified array of bytes.
update(byte[], int, int) - Method in class java.util.zip.Adler32
  Updates checksum with specified array of bytes.
update(byte[], int, int) - Method in interface java.util.zip.Checksum
  Updates the current checksum with the specified array of bytes.
update(int) - Method in class java.util.zip.CRC32
  Updates CRC-32 with specified byte.
update(int) - Method in class java.util.zip.Adler32
  Updates checksum with specified byte.
update(int) - Method in interface java.util.zip.Checksum
  Updates the current checksum with the specified byte.
update(Observable, Object) - Method in interface java.util.Observer
  This method is called whenever the observed object is changed.
UPPERCASE_LETTER - Static variable in class java.lang.Character
  Public data for enumerated Unicode general category types.
url - Variable in class java.net.URLConnection
  The URL represents the remote object on the World Wide Web to which this connection is opened.
URL - class java.net.URL.
  Class `URL` represents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web.
URL(String) - Constructor for class java.net.URL
  Creates a `URL` object from the `String` representation.
URL(String, String, int, String) - Constructor for class java.net.URL
  Creates a `URL` object from the specified `protocol`, `host`, `port` number, and `file`.
URL(String, String, int, String, URLStreamHandler) - Constructor for class java.net.URL
  Creates a `URL` object from the specified `protocol`, `host`, `port` number, `file`, and `handler`.
URL(String, String, String) - Constructor for class java.net.URL
  Creates a URL from the specified `protocol` name, `host` name, and `file` name.
URL(URL, String) - Constructor for class java.net.URL
  Creates a URL by parsing the given spec within a specified context.
URL(URL, String, URLStreamHandler) - Constructor for class java.net.URL
  Creates a URL by parsing the given spec with the specified handler within a specified context.
URLClassLoader - class java.net.URLClassLoader.
  This class loader is used to load classes and resources from a search path of URLs referring to both JAR files and directories.
URLClassLoader(URL[]) - Constructor for class java.net.URLClassLoader
  Constructs a new URLClassLoader for the specified URLs using the default delegation parent `ClassLoader`.
URLClassLoader(URL[], ClassLoader) - Constructor for class java.net.URLClassLoader
  Constructs a new URLClassLoader for the given URLs.
URLClassLoader(URL[], ClassLoader, URLStreamHandlerFactory) - Constructor for class java.net.URLClassLoader
  Constructs a new URLClassLoader for the specified URLs, parent class loader, and URLStreamHandlerFactory.
URLConnection - class java.net.URLConnection.
  The abstract class `URLConnection` is the superclass of all classes that represent a communications link between the application and a URL.
URLConnection(URL) - Constructor for class java.net.URLConnection
  Constructs a URL connection to the specified URL.
URLDecoder - class java.net.URLDecoder.
  The class contains a utility method for converting from a MIME format called "`x-www-form-urlencoded`" to a `String`
URLDecoder() - Constructor for class java.net.URLDecoder
URLEncoder - class java.net.URLEncoder.
  The class contains a utility method for converting a `String` into a MIME format called "`x-www-form-urlencoded`" format.
URLStreamHandler - class java.net.URLStreamHandler.
  The abstract class `URLStreamHandler` is the common superclass for all stream protocol handlers.
URLStreamHandler() - Constructor for class java.net.URLStreamHandler
URLStreamHandlerFactory - interface java.net.URLStreamHandlerFactory.
  This interface defines a factory for `URL` stream protocol handlers.
US - Static variable in class java.util.Locale
  Useful constant for country.
useCaches - Variable in class java.net.URLConnection
  If `true`, the protocol is allowed to use caching whenever it can.
useDaylightTime() - Method in class java.util.TimeZone
  Queries if this time zone uses daylight savings time.
useDaylightTime() - Method in class java.util.SimpleTimeZone
  Overrides TimeZone Queries if this time zone uses Daylight Savings Time.
useProtocolVersion(int) - Method in class java.io.ObjectOutputStream
  Specify stream protocol version to use when writing the stream.
usingProxy() - Method in class java.net.HttpURLConnection
  Indicates if the connection is going through a proxy.
UTFDataFormatException - exception java.io.UTFDataFormatException.
  Signals that a malformed UTF-8 string has been read in a data input stream or by any class that implements the data input interface.
UTFDataFormatException() - Constructor for class java.io.UTFDataFormatException
  Constructs a `UTFDataFormatException` with `null` as its error detail message.
UTFDataFormatException(String) - Constructor for class java.io.UTFDataFormatException
  Constructs a `UTFDataFormatException` with the specified detail message.

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