Reference:Java.lang.Object

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java.lang
public class java.lang.Object

java.lang.Object

This class must be implemented by the vm vendor. Object is the root of the java class hierarchy. All non-base types respond to the messages defined in this class.

Contents 1 Known Direct Subclasses 2 Known Indirect Subclasses 3 Summary 3.1 Public Constructors 3.2 Public Methods 3.3 Protected Methods 4 Details 4.1 Public Constructors 4.1.1 public Object() 4.2 Public Methods 4.2.1 public boolean equals(Object o) 4.2.2 public final Class getClass() 4.2.3 public int hashCode() 4.2.4 public final void notify() 4.2.5 public final void notifyAll() 4.2.6 public String toString() 4.2.7 public final void wait(long time, int frac) 4.2.8 public final void wait(long time) 4.2.9 public final void wait() 4.3 Protected Methods 4.3.1 protected Object clone() 4.3.2 protected void finalize() 5 References

[edit] Known Direct Subclasses

AUTH, AbsListView.CheckForKeyLongPress, AbsListView.CheckForLongPress, AbsListView.CheckForTap, AbsListView.RecycleBin, AbstractAuthenticationHandler, AbstractClientConnAdapter, AbstractCollection, AbstractConnPool, AbstractCookieAttributeHandler, AbstractCookieSpec, AbstractCursor, AbstractExecutorService, AbstractHttpClient, AbstractHttpClientConnection, AbstractHttpEntity, AbstractHttpMessage, AbstractHttpParams, AbstractHttpServerConnection, AbstractInterruptibleChannel, AbstractMap, AbstractMessageParser, AbstractMessageWriter, AbstractPoolEntry, AbstractQueuedSynchronizer, AbstractQueuedSynchronizer.ConditionObject, AbstractSessionInputBuffer, AbstractSessionOutputBuffer, AbstractTableMerger, AbstractVerifier, AccelerateDecelerateInterpolator, AccelerateInterpolator, AccessControlContext, AccessController, AccessibleObject, ActivityManager, ActivityManager.RecentTaskInfo, ActivityManager.RunningTaskInfo, ActivityPendingResult, Adapter, AdapterView.ContextMenuInfo, Address, Adler32, AlarmManager, AlertDialog.Builder, AlgorithmParameterGenerator, AlgorithmParameterGeneratorSpi, AlgorithmParameters, AlgorithmParametersSpi, AlignmentSpan.Standard, AlphaKeyTable, AlteredCharSequence, AndroidCharacter, AndroidClip, AndroidJavaBlitter, AndroidMIDIPlayBackEngine, AndroidPlayBackEngine, AndroidSequencer, AndroidSourceDataLine, Animation, Animation.Description, AnimationUtils, Annotation, ApplicationInfo, ApplicationInfo.DisplayNameComparator, Array, ArrayUtils, Arrays, ArrowKeyMovementMethod, Assert, AssetManager, AtCommandHandler, AtCommandResult, AtParser, AtomicBoolean, AtomicIntegerArray, AtomicIntegerFieldUpdater, AtomicLongArray, AtomicLongFieldUpdater, AtomicMarkableReference, AtomicReference, AtomicReferenceArray, AtomicReferenceFieldUpdater, AtomicStampedReference, AttributeListImpl, AttributedCharacterIterator.Attribute, AttributedString, Attributes, Attributes.Name, AttributesImpl, AudioFileFormat, AudioFileFormat.Type, AudioFileReader, AudioFileWriter, AudioFormat, AudioFormat.Encoding, AudioSystem, AuthParams, AuthPolicy, AuthSchemeRegistry, AuthScope, AuthState, Authenticator, AutoText, AwtFactory, Base64Utils, BaseAdapter, BaseExpandableListAdapter, BasicClientCookie, BasicCookieStore, BasicCredentialsProvider, BasicDomainHandler, BasicEofSensorWatcher, BasicHeader, BasicHeaderElement, BasicHeaderIterator, BasicHeaderValueFormatter, BasicHeaderValueParser, BasicHttpContext, BasicHttpProcessor, BasicLineFormatter, BasicLineParser, BasicNameValuePair, BasicPathHandler, BasicRequestLine, BasicRouteDirector, BasicSchemeFactory, BasicStatusLine, Bidi, Binder, BitSet, Bitmap, BitmapFactory, BitmapFactory.Options, BluetoothAudioGateway, BluetoothAudioGateway.IncomingConnectionInfo, Boolean, BreakIterator, Browser, Browser.BookmarkColumns, Browser.SearchColumns, BrowserCompatSpecFactory, Buffer, BufferedHeader, Build, BulletSpan, Bundle, ByteArrayBuffer, ByteArrayPartSource, ByteOrder, CRC32, CRL, CacheManager, CacheRequest, CacheResponse, CacheSyncManager, Calendar, CallLog, CallLog.Calls, Camera, CameraDevice, CameraDevice.CaptureParams, Canvas, CertPath, CertPath.CertPathRep, CertPathBuilder, CertPathBuilderSpi, CertPathTrustManagerParameters, CertPathValidator, CertPathValidatorSpi, CertStore, CertStoreSpi, Certificate, Certificate.CertificateRep, CertificateFactory, CertificateFactorySpi, Channels, CharArrayBuffer, CharSequences, Character, Character.Subset, CharacterStyle, Charset, CharsetDecoder, CharsetEncoder, CharsetProvider, Cipher, CipherSpi, Class, ClassDefinition, ClassLoader, CodeSigner, CodeSource, CoderResult, CodingErrorAction, CollationElementIterator, CollationKey, Collator, CollectionCertStoreParameters, Collections, Color, ColorFilter, ColorMatrix, ColorStateList, Compiler, ComponentName, ConditionVariable, Config, ConnPoolByRoute.WaitingThread, Connection, ConnectionError, ConnectionManager, ConnectionState, Contacts, Contacts.ContactMethods, Contacts.Intents, Contacts.Intents.Insert, Contacts.Intents.UI, Contacts.People, Contacts.People.ContactMethods, Contacts.People.Phones, Contacts.Phones, ContentHandler, ContentObserver, ContentProvider, ContentResolver, ContentUris, ContentValues, Context, Control, Control.Type, CookieHandler, CookieIdentityComparator, CookieManager, CookieOrigin, CookiePathComparator, CookiePolicy, CookieSpecRegistry, CookieSyncManager, CopyOnWriteArrayList, CountDownLatch, Criteria, Currency, CursorTreeAdapter.MyCursorHelper, CursorWindow, CycleInterpolator, CyclicBarrier, DESKeySpec, DESedeKeySpec, DHGenParameterSpec, DHParameterSpec, DHPrivateKeySpec, DHPublicKeySpec, DSAParameterSpec, DSAPrivateKeySpec, DSAPublicKeySpec, DataSetObserver, Database, DatabaseUtils, DatagramPacket, DatagramSocket, DatagramSocketImpl, Date, DateFormat, DateFormatSymbols, DateSorter, DateUtils, Debug, Debug.InstructionCount, DebugUtils, DecelerateInterpolator, DecimalFormatSymbols, DefaultClientConnectionOperator, DefaultClientRequestDirector, DefaultConnectionReuseStrategy, DefaultHandler, DefaultHttpRequestFactory, DefaultHttpRequestRetryHandler, DefaultHttpResponseFactory, DefaultHttpRoutePlanner, DefaultRedirectHandler, Deflater, Dialog, Dictionary, DigestSchemeFactory, Display, DisplayMetrics, DocumentBuilder, DocumentBuilderFactory, DrawFilter, Drawable, Drawable.ConstantState, DrawableMarginSpan, DriverManager, DriverPropertyInfo, ECFieldF2m, ECFieldFp, ECGenParameterSpec, ECParameterSpec, ECPoint, ECPrivateKeySpec, ECPublicKeySpec, Element, EllipticCurve, EncodedKeySpec, EncodingUtils, EncryptedPrivateKeyInfo, EnglishReasonPhraseCatalog, EntityDeserializer, EntitySerializer, EntityUtils, Enum, Environment, ErrorManager, EventListenerProxy, EventObject, ExceptionUtils, Exchanger, ExecutorCompletionService, Executors, ExemptionMechanism, ExemptionMechanismSpi, ExpandableListView.ExpandableListContextMenuInfo, FaceDetector, FaceDetector.Face, FieldPosition, File, FileChannel.MapMode, FileDescriptor, FileLock, FileObserver, FilePartSource, Filter, Filter.FilterResults, FocusFinder, Format, FormatConversionProvider, FormattableFlags, Formatter, FutureTask, GLDebugHelper, GLU, GTalkServiceConstants, Geocoder, Gravity, GroupChatInvitation, GuardedObject, HTTP, Handler, HandlerBase, HeaderGroup, HeaderViewListAdapter, HeadsetBase, HexDump, Html, HttpClientParams, HttpConnParams, HttpConnectionManagerParams, HttpConnectionMetricsImpl, HttpConnectionParams, HttpDateGenerator, HttpEntityWrapper, HttpHost, HttpParamsLinker, HttpProtocolParams, HttpRequestExecutor, HttpRequestHandlerRegistry, HttpRoute, HttpService, HttpTransportMetricsImpl, IconMarginSpan, Identity, IdleConnectionHandler, InetAddress, InetAddressUtils, Inflater, InputFilter.AllCaps, InputFilter.LengthFilter, InputSource, InputStream, Instrumentation, Instrumentation.ActivityMonitor, Instrumentation.ActivityResult, Intent, Intent.FilterComparison, IntentFilter, IntentFilter.AuthorityEntry, IntentFilter.PathEntry, IntentReceiver, Interpolator, IvParameterSpec, JSONArray, JSONObject, JSONStringer, JSONTokener, JsResult, KeyAgreement, KeyAgreementSpi, KeyCharacterMap, KeyEvent, KeyFactory, KeyFactorySpi, KeyGenerator, KeyGeneratorSpi, KeyManagerFactory, KeyManagerFactorySpi, KeyPair, KeyPairGeneratorSpi, KeyRep, KeyStore, KeyStore.Builder, KeyStore.CallbackHandlerProtection, KeyStore.PasswordProtection, KeyStore.PrivateKeyEntry, KeyStore.SecretKeyEntry, KeyStore.TrustedCertificateEntry, KeyStoreBuilderParameters, KeyStoreSpi, KeyguardManager, KeyguardManager.KeyguardLock, LDAPCertStoreParameters, LangUtils, LaxContentLengthStrategy, Layout, Layout.Directions, LayoutAnimationController, LayoutAnimationController.AnimationParameters, LeadingMarginSpan.Standard, Level, Line.Info, LineEvent.Type, LinearInterpolator, Linkify, ListHeaderIterator, LocalActivityManager, Locale, Location, LocationManager, LocationProvider, LocatorImpl, LockSupport, Log, LogManager, LogPrinter, LogRecord, Logger, LoginFilter, Looper, MGF1ParameterSpec, Mac, MacSpi, Manager, Manifest, Manifest.permission, MapController, MaskFilter, Matcher, Math, MathContext, MathUtils, Matrix, MediaController, MediaPlayer, MediaRecorder, MediaRecorder.AudioEncoder, MediaRecorder.AudioSource, MediaRecorder.OutputFormat, MediaRecorder.VideoEncoder, MediaRecorder.VideoSource, Menu, MenuBuilder, MergeResult, MergeStats, Message, MessageDigestSpi, MessageQueue, MetaKeyInputMethod, MidiDevice.Info, MidiDeviceProvider, MidiEvent, MidiFileFormat, MidiFileReader, MidiFileWriter, MidiMessage, MidiSystem, Mixer.Info, MixerProvider, Modifier, MonthDisplayHelper, MotionEvent, Movie, NamespaceSupport, NetscapeDraftSpecFactory, NetworkInterface, NinePatch, NoConnectionReuseStrategy, Notification, NotificationManager, Number, OAEPParameterSpec, ObjectInputStream.GetField, ObjectOutputStream.PutField, ObjectStreamClass, ObjectStreamField, Objects, Observable, OpenGLContext, OutputStream, Overlay, Overlay.PixelCalculator, OverlayController, PBEKeySpec, PBEParameterSpec, PKIXCertPathChecker, PKIXCertPathValidatorResult, PKIXParameters, PSSParameterSpec, PSource, Pack200, Package, PackageInfo, PackageItemInfo, PackageItemInfo.DisplayNameComparator, PackageManager, PackedFloatVector, PackedIntVector, PackedObjectVector, Paint, Paint.FontMetrics, Paint.FontMetricsInt, Parcel, ParcelFileDescriptor, ParsePosition, ParserAdapter, ParserFactory, Part, PasswordAuthentication, PasswordCallback, PasswordTransformationMethod, Patch, Path, PathEffect, PathMeasure, Pattern, Permission, PermissionCollection, PhoneNumberUtils, Picture, Pipe, PixelFormat, PlainSocketFactory, Point, PointF, Policy, PolicyQualifierInfo, PopupWindow, PorterDuffColorFilter, PowerManager, PowerManager.WakeLock, Preferences, Presence, PrintWriterPrinter, Process, ProcessBuilder, ProtectionDomain, ProtocolVersion, Provider.Service, Proxy, ProxySelector, QuoteSpan, R, R.anim, R.array, R.attr, R.color, R.dimen, R.drawable, R.id, R.layout, R.string, R.style, R.styleable, R.xml, RC2ParameterSpec, RC5ParameterSpec, RFC2109DomainHandler, RFC2109SpecFactory, RFC2617Scheme, RFC2965CommentUrlAttributeHandler, RFC2965DiscardAttributeHandler, RFC2965DomainAttributeHandler, RFC2965PortAttributeHandler, RFC2965SpecFactory, RFC2965VersionAttributeHandler, RSAKeyGenParameterSpec, RSAOtherPrimeInfo, RSAPrivateKeySpec, RSAPublicKeySpec, Random, RandomAccessFile, Rasterizer, RawInputEvent, Reader, Rect, RectF, ReentrantLock, ReentrantReadWriteLock, ReentrantReadWriteLock.ReadLock, ReentrantReadWriteLock.WriteLock, RefQueueWorker, Reference, ReferenceQueue, Regex, Region, RegionIterator, RemoteCallbackList, RemoteViews, ReplacementTransformationMethod, RequestAddCookies, RequestConnControl, RequestContent, RequestDate, RequestDefaultHeaders, RequestExpectContinue, RequestProxyAuthentication, RequestTargetAuthentication, RequestTargetHost, RequestUserAgent, ResettableTimeout, ResolveInfo, ResolveInfo.DisplayNameComparator, ResourceBundle, Resources, Resources.Configuration, Resources.StyledAttributes, Resources.Theme, ResponseCache, ResponseConnControl, ResponseContent, ResponseDate, ResponseProcessCookies, ResponseServer, ReverbType, RfcommSocket, RouteSpecificPool, RouteTracker, RoutedRequest.Impl, Runtime, SAXParser, SAXParserFactory, SDPClient, SQLiteDatabase, SQLiteOpenHelper, SQLiteProgram, SQLiteQueryBuilder, SSLContext, SSLContextSpi, SSLEngine, SSLEngineResult, SSLSocketFactory, Scanner, Scheme, SchemeRegistry, Scroller, ScrollingMovementMethod, SealedObject, SearchManager, SecretKeyFactory, SecretKeyFactorySpi, SecretKeySpec, SecureRandomSpi, Security, SecurityManager, Selection, SelectionKey, Selector, SelectorProvider, Semaphore, Sensors, Sequence, Sequencer.SyncMode, ServerSocket, ServerSocketFactory, ServiceState, Settings, Settings.System, Shader, Shape, SignatureSpi, SignedObject, SimUtils, SingleClientConnManager, SmsHeader, SmsHeader.Element, SmsManager, SmsMessage, SmsMessage.SubmitPdu, SmsRawData, Socket, SocketAddress, SocketFactory, SocketImpl, SoundbankReader, SoundbankResource, SpannableString, SpannableStringBuilder, SpannedString, SparseArray, SparseBooleanArray, SparseIntArray, StackTraceElement, StateSet, StreamTokenizer, StrictContentLengthStrategy, StrictMath, String, StringBuffer, StringBuilder, StringBuilderPrinter, StringCharacterIterator, StringTokenizer, Subject, SubjectDomainCombiner, Surface, SurfaceSession, SyncAdapter, SyncAdapter.SyncData, SyncContext, SyncContextTest, SyncContextTest.IPC, SyncObserver, SyncStateContentProviderHelper, System, SystemClock, SystemProperties, TabHost.TabSpec, TabStopSpan.Standard, TelephoneNumberUtil, TestFailure, TestResult, TestSuite, TextUtils, Texture, Thread, ThreadGroup, ThreadLocal, ThreadPoolExecutor.AbortPolicy, ThreadPoolExecutor.CallerRunsPolicy, ThreadPoolExecutor.DiscardOldestPolicy, ThreadPoolExecutor.DiscardPolicy, ThreadSafeClientConnManager, Throwable, TimeUtils, TimeZone, Timer, TimerTask, Timestamp, TimingLogger, Toast, TokenWatcher, TouchGestureDetector, Track, TrackballGestureDetector, Transformation, TrustAnchor, TrustManagerFactory, TrustManagerFactorySpi, TypedValue, Typeface, Types, UIThreadUtilities, URI, URL, URLConnection, URLDecoder, URLEncoder, URLStreamHandler, URLUtil, URLUtils, UUID, Uri, Uri.Builder, UriMatcher, UrlQuerySanitizer, UrlQuerySanitizer.IllegalCharacterValueSanitizer, UrlQuerySanitizer.ParameterValuePair, UsernamePasswordCredentials, VelocityTracker, VersionInfo, Vibrator, View, View.CheckForKeyLongPress, View.MeasureSpec, ViewConfiguration, ViewDebug, ViewGroup.LayoutParams, ViewInflate, Visibility, VoiceStatus, Void, VolumePanel, WebBackForwardList, WebChromeClient, WebHistoryItem, WebIconDatabase, WebSettings, WebViewClient, Window, Wire, Writer, X500Principal, X509CRLEntry, X509CRLSelector, X509CertSelector, X509ExtendedKeyManager, XMLFilterImpl, XMLReaderAdapter, XMLReaderFactory, Xfermode, Xml, XmlPullAttributes, ZipEntry, ZipFile

[edit] Known Indirect Subclasses

AbsListView, AbsoluteLayout, AbsoluteLayout.LayoutParams, AbstractCursor.SelfContentObserver, AbstractList, AbstractMethodError, AbstractPooledConnAdapter, AbstractPreferences, AbstractQueue, AbstractSelectableChannel, AbstractSelectionKey, AbstractSelector, AbstractSequentialList, AbstractSet, AbstractWindowedCursor, AccessControlException, AclNotFoundException, ActiveTestSuite, Activity, ActivityAdapter, ActivityGroup, ActivityIconAdapter, ActivityInfo, ActivityNotFoundException, Adapter.Mode, AdapterView, AdapterView.MyDataSetObserver, AlertDialog, AllPermission, AllowAllHostnameVerifier, AlphaAnimation, AlreadyConnectedException, AnalogClock, AndroidAudioInputStream, AndroidException, AndroidGraphics2D, AndroidGraphicsConfiguration, AndroidGraphicsFactory, AndroidImageDecoder, AndroidNativeEventQueue, AndroidRuntimeException, AndroidWTK, AnimationDrawable, AnimationSet, AnnotationFormatError, AnnotationTypeMismatchException, Application, ApplicationContext, ArithmeticException, ArrayAdapter, ArrayBlockingQueue, ArrayIndexOutOfBoundsException, ArrayList, ArrayListCursor, ArrayStoreException, AssertionError, AssertionFailedError, AssetManager.AssetInputStream, AsyncQueryHandler, AsynchronousCloseException, AtomicInteger, AtomicLong, Attributes2Impl, AudioInputStream, AudioPermission, AuthPermission, AuthProvider, Authenticator.RequestorType, AutoCompleteTextView, BackgroundColorSpan, BackingStoreException, BadPaddingException, BadParcelableException, BaseInputMethod, BasicClientCookie2, BasicCommentHandler, BasicExpiresHandler, BasicHttpEntity, BasicHttpEntityEnclosingRequest, BasicHttpParams, BasicHttpRequest, BasicHttpResponse, BasicManagedEntity, BasicMaxAgeHandler, BasicPermission, BasicPoolEntry, BasicPoolEntryRef, BasicPooledConnAdapter, BasicScheme, BasicSecureHandler, BatchUpdateException, BigDecimal, BigInteger, BindException, Bitmap.CompressFormat, Bitmap.Config, BitmapDrawable, BitmapShader, BluetoothServiceNative, BlurMaskFilter, BlurMaskFilter.Blur, BooleanControl, BooleanControl.Type, BoringLayout, BoringLayout.Metrics, BrokenBarrierException, BrowserCompatHostnameVerifier, BrowserCompatSpec, BufferOverflowException, BufferUnderflowException, BufferedHttpEntity, BufferedInputStream, BufferedOutputStream, BufferedReader, BufferedWriter, Button, Byte, ByteArrayEntity, ByteArrayInputStream, ByteArrayOutputStream, ByteBuffer, CRLException, CancellationException, CancelledKeyException, Canvas.EdgeType, CertPathBuilderException, CertPathValidatorException, CertStoreException, CertificateEncodingException, CertificateException,