Abstract type: Difference between revisions
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Here Node is an abstract type that is inherited from Limited_Controlled and implements a node of a [[Doubly-Linked List (element) | doubly linked list]]. It also implements the interface of a queue described above, because any node can be considered a head of the queue of linked elements. For the operation Finalize an implementation is provided to ensure that the element of a list is removed from there upon its finalization. The operation itself is inherited from the parent type Limited_Controlled and then overridden. The operations Dequeue and Enqueue of the Queue interface are also implemented.
=={{header|Java}}==
Abstract classes in Java can define methods and aren't required to have abstract methods. If a method is abstract, it must be public or protected
<java>public abstract class Abs {
abstract public int method1(double value);
abstract protected int method2(String name);
int add(int a, int b){
return a+b;
}
}</java>
Interfaces in Java may not define any methods and all methods must be public and can be abstract.
<java>public interface Abs {
public int method1(double value);
public int method2(String name);
abstract public int add(int a, int b);
}</java>
=={{header|Python}}==
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