Java-object Source Code Analysis

The Java.lang package does not need to display the import when it is used, and is automatically imported by the compiler at compile time. The object class is the root of the class-level results, and all classes in Java inherit from this class fundamentally. The object class is the only subclass in Java that does not have a parent class. All other classes, including standard container classes, such as arrays, inherit the methods in the object class. The object class includes the following methods: (1) object (): the default constructor. (2) GetClass (): Returns the run-time class of an object. (3) Hashcode (): Returns a hash code value to the object. (4) Equals (Object obj): Determines whether an object obj is equal to this object. (5) Clone (): Creates and returns a copy of this object. (6) toString (): Returns the string that is converted to 16 by the class name and by the hashcode value. (7) Notify (): Wakes up a single thread waiting on this object monitor. (8) Notifyall (): Wakes up all the threads waiting on this object monitor. (9) Wait (): Causes the current thread to wait until other threads call the Notify () method of this object or the Notifyall () method. Wait (long timeout) causes the current thread to wait until another thread calls the Notify () method of this object or notify (), or exceeds the specified amount of time. (one) Wait (long Timeout,int Nanos): Causes the current thread to wait until another thread calls the Notify () method of this object or the Notifyall () method, or some other thread interrupts the current thread, or has exceeded an actual amount of time.registernatives (): Static method, several local methods are registered, some of the above functions are local methods.

Based on the Java8 object source code:

Public classObject {private static native voidregisternatives();Static{registernatives();    }Public Final nativeClass<?>GetClass();public native inthashcode();Public Booleanequals(Object obj) {return( This= = obj);    }protected nativeObjectClone()throwsClonenotsupportedexception; PublicStringtoString() {returnGetClass (). GetName () +"@" + Integer.tohexstring(Hashcode ());    }Public final native voidNotify();Public final native voidNotifyall();Public final native voidwait(LongTimeoutthrowsInterruptedexception;Public final voidwait(LongTimeout, intNanosthrowsinterruptedexception {if(Timeout <0) {throw NewIllegalArgumentException ("Timeout value is negative");        }if(Nanos <0|| Nanos >999999) {throw NewIllegalArgumentException ("nanosecond timeout value out of range");        }off(Nanos >=500000|| (Nanos! =0&& Timeout = =0)) {timeout++;        } Wait (timeout);    }Public final voidwait()throwsinterruptedexception {Wait (0);    }protected voidFinalize()throwsThrowable {}}

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Java-object Source Code Analysis