17 Oct 2014

ObjectClassInJava

The class Object is very useful and a lot of advanced functions of java is based on this class so it is very helpful to know about the api of this class.

The Class Object</h2> The class Object is a superclass of all other classes. All class and array types inherit the methods of class Object, which are summarized as follows: ``` The method "clone" is used to make a duplicate of an object. ``` ``` The method equals defines a notion of object equality, which is based on value, not reference, comparison. ``` ``` The method finalize is run just before an object is destroyed ``` ``` The method getClass returns the Class object that represents the class of the object. A Class object exists for each reference type. It can be used, for example, to discover the fully qualified name of a class, its members, its immediate superclass, and any interfaces that it implements. The type of a method invocation expression of getClass is Class<? extends |T|> where T is the class or interface searched for getClass. A class method that is declared synchronized synchronizes on the monitor associated with the Class object of the class. ``` ``` The method hashCode is very useful, together with the method equals, in hashtables such as java.util.Hashmap. ``` ``` The methods wait, notify, and notifyAll are used in concurrent programming using threads ``` ``` The method toString returns a String representation of the object ``` 乐此不疲～ 2014-10-17 10:00:11

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