¿Puede la clase secundaria crear un objeto de la clase principal?

Can child class create object of parent class?

The reference variable of the Parent class is capable to hold its object reference as well as its child object reference.

A private field can only be accessed from within the class….When you instantiate an object of child class.

• All fields of parent as well as child class are initialized, irrespective of access modifier (private, protected or public)
• Constructor of parent class is called.
• Constructor of child class is called.

DefaultObject default = new DefaultObject { /* propery initialization */ }; ExtendedObject extended = new ExtendedObject (default); // now all properties of extended are initialized by values of default properties. MessageBox.Show (extended.Parent.ToString ()); // now you can get reference to parent object

A child class inherits all public and protected properties and methods from the parent, and can use them in it’s own code and transmits them when an instance of the child subclass is created. As in nature, children inherit the parent’s genes. Here’s how to use inheritance in ActionScript 3 programming.

The super () function calls the constructor method of a parent class, it must contain a number of arguments equal to the number of parameter of the constructor from the parent class. If it’s not added in the child class code, it will automatically be added by the program, but without arguments.

To rewrite a method use override keyword in the definition of that method in the child class. With this syntax: – Rewritting a method does not affect the original in the parent class, the modifications are available only in the child class, respectively in its subclasses.

In Java inheritance we can access parent class properties via the child class object, as there is a keyword extends for achieving inheritance.

Methods of object class in java :

• protected native Object clone() throws CloneNotSupportedException.
• public boolean equals(Object obj)
• protected void finalize() throws Throwable.
• public final native Class getClass()
• public native int hashCode()
• public String toString()
• public final native void notify()

The reason is parent object has the data and the child object will have the lookup field which will refer those data. Hence whichever object you create a lookup field will be the child object and the data which it refers to is considered as the parent object. Hope this helps.

If we create a new object and add it to the object it will be a reference. This can be added to multiple objects but it is not a parent child ‘object/class’ but it is just an object holding a reference to an external object. The use of parent/child here may be what is making this so hard for the OP to explain.

obj.subObj is just a reference of the Object. If it were possible to get the “parent” of the Object, it would be a mess, simply because there can be multiple pointers pointing to the same Object and it will return multiple parents. – Derek 朕會功夫 Jul 6 ’14 at 22:43 @JLRishe – I just ran across something today and wanted to run it by you.

The referenced object is not a parent unless you say it is. If you want multiple parents then you need to design that and enforce it with code. If you add a -property (as noted) it will not be a reference to an object because it will be a copy of the value of the object.