Topic 26: Object class in Java

• Object is a special class defined by Java. 

• Object is a superclass of all classes in Java. A Object class reference variable can refer to an object of any other class including arrays, since arrays are implemented as classes.

• The following methods are available in every object:

• Object clone( ) - Creates a new object that is the same as the object being cloned.

• boolean equals(Object object) - Determines whether one object is equal to another.

• void finalize( ) - Called before an unused object is recycled.

• Class getClass( ) - Obtains the class of an object at run time.

• int hashCode( ) - Returns the hash code associated with the invoking object.

• void notify( ) - Resumes execution of a thread waiting on the invoking object.

• void notifyAll( ) - Resumes execution of all threads waiting on the invoking object.

• String toString( ) - Returns a string that describes the object.

• void wait( ) - Waits on another thread of execution.

• void wait(long milliseconds) - Waits on another thread of execution.

• void wait(long milliseconds, int nanoseconds) - Waits on another thread of execution.

The methods getClass( ), notify( ), notifyAll( ), and wait( ) are declared as final. We may override the others.

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