Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z] unary operators ! (boolean NOT) operator - (negation) operator operand number and type right-to-left associativity ~ (bitwise complement) unbounded wildcards unboxing conversions [See boxing and unboxing conversions] uncaught exceptions in threads 2nd 3rd UncaughtExceptionHandler unchecked exceptions unchecked warnings, raw types and UndeclaredThrowableException 2nd unicast events registering listener for Unicode 2nd byte-to-character conversions 2nd char data type characters in Java names CharBuffer class converting strings to/from bytes currency symbols in identifiers escape sequences escaping in char literals IllegalFormatCodePointException native2ascii tool and subsets of UnicodeBlock class supplementary characters Character class methods for String methods for UTF-8 encoding 2nd 3rd 4th converting Latin-1 to malformed strings writing with DataOutputStream UTFDataFormatException Version 3.0 Bidirectional Algorithm versions union type (C language) Universal Time (UTC) Universal Unique Identifier (UUID) Unix classpath, specifying emacs text editor file and path separators Java interpreter pipes root directory threads for Java interpreter and Classic VM UnknownError UnknownFormatConversionException UnknownFormatFlagsException UnknownHostException UnknownServiceException UnmappableCharsetException unmodifiable methods (Collection) UnmodifiableClassException unnamed packages unordered collection with duplicate elements (bag) unpack200 tool Unpacker interface (Pack200) unread( ) PushbackInputStream class PushbackReader class UnrecoverableEntryException UnrecoverableKeyException UnresolvedAddressException UnresolvedAddressTypeException UnresolvedPermission class UnsatisfiedLinkError unsigned right shift operator (>>>) 2nd unsigned values reading and returning as int values UnsupportedCallbackException UnsupportedCharsetException UnsupportedClassVersionError UnsupportedEncodingException UnsupportedOperationException 2nd 3rd 4th until loops untrusted code access control fine-grained levels in Java 1.2 sandbox (Java 1.0) application programming, use in byte-code verification of class files unwrap( ) (SSLEngine) 2nd update( ) Checksum interface Cipher class MessageDigest class 2nd Observable class Observer interface Signature class upper-bounded wildcards URIs (Uniform Resource Identifiers) URI class URIs (Universal Resource Identifiers) URIResolver interface URISyntaxException XML namespaces URLConnection class caching retrieved network resources URLs (Uniform Resource Locators) https \: HttpsURLConnection HttpURLConnection class JarURLConnection javadoc-generated documents keystore file MalformedURLException URL class 2nd 3rd caching retrieved network resources URLClassLoader class 2nd permissions to loaded code URLConnection class 2nd URLDecoder class URLEncoder class URLStreamHandler class US-ASCII charset useProtocolVersion( ) (ObjectOutputStream) user preferences [See preferences] UserDataHandler interface (DOM) username and password, encapsulating userNodeForPackage( ) (Preferences) users, security for UTC (Universal Time) UTF-8 [See Unicode] UTFDataFormatException utility classes packages UUID class |