What is ADT? (Abstract Data Type)

Question

I am currently studying about Abstract Data Types (ADT\'s) but I don\'t get the concept at all. Can someone please explain to me what this actually is? Also what is collecti

Answer 1

An abstract data type, sometimes abbreviated ADT, is a logical description of how we view the data and the operations that are allowed without regard to how they will be implemented. This means that we are concerned only with what the data is representing and not with how it will eventually be constructed.

https://runestone.academy/runestone/books/published/pythonds/Introduction/WhyStudyDataStructuresandAbstractDataTypes.html

Answer 2

A truly abstract data type describes the properties of its instances without commitment to their representation or particular operations. For example the abstract (mathematical) type Integer is a discrete, unlimited, linearly ordered set of instances. A concrete type gives a specific representation for instances and implements a specific set of operations.

Answer 3

ADT is a data type in which collection of data and operation works on that data . It focuses on more the concept than implementation.. It's up to you which language you use to make it visible on the earth Example: Stack is an ADT while the Array is not Stack is ADT because we can implement it by many languages, Python c c++ java and many more , while Array is built in data type

Answer 4

Before defining abstract data types, let us considers the different view of system-defined data types. We all know that by default all primitive data types (int, float, etc.) support basic operations such as addition and subtraction. The system provides the implementations for the primitive data types. For user-defined data types, we also need to define operations. The implementation for these operations can be done when we want to actually use them. That means in general, user-defined data types are defined along with their operations.

To simplify the process of solving problems, we combine the data structures with their operations and we call this "Abstract Data Type". (ADT's).

Commonly used ADT'S include: Linked List, Stacks, Queues, Binary Tree, Dictionaries, Disjoint Sets (Union and find), Hash Tables and many others.

ADT's consist of two types:

1. Declaration of data.

2. Declaration of operation.

Answer 5

The Abstact data type Wikipedia article has a lot to say.

In computer science, an abstract data type (ADT) is a mathematical model for a certain class of data structures that have similar behavior; or for certain data types of one or more programming languages that have similar semantics. An abstract data type is defined indirectly, only by the operations that may be performed on it and by mathematical constraints on the effects (and possibly cost) of those operations.

In slightly more concrete terms, you can take Java's List interface as an example. The interface doesn't explicitly define any behavior at all because there is no concrete List class. The interface only defines a set of methods that other classes (e.g. ArrayList and LinkedList) must implement in order to be considered a List.

A collection is another abstract data type. In the case of Java's Collection interface, it's even more abstract than List, since

The List interface places additional stipulations, beyond those specified in the Collection interface, on the contracts of the iterator, add, remove, equals, and hashCode methods.

A bag is also known as a multiset.

In mathematics, the notion of multiset (or bag) is a generalization of the notion of set in which members are allowed to appear more than once. For example, there is a unique set that contains the elements a and b and no others, but there are many multisets with this property, such as the multiset that contains two copies of a and one of b or the multiset that contains three copies of both a and b.

In Java, a Bag would be a collection that implements a very simple interface. You only need to be able to add items to a bag, check its size, and iterate over the items it contains. See Bag.java for an example implementation (from Sedgewick & Wayne's Algorithms 4th edition).

Answer 6

in a simple word: An abstract data type is a collection of data and operations that work on that data. The operations both describe the data to the rest of the program and allow the rest of the program to change the data. The word “data” in “abstract data type” is used loosely. An ADT might be a graphics window with all the operations that affect it, a file and file operations, an insurance-rates table and the operations on it, or something else.

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