CODEWITHSUNDEEP
javacomposition
Ahmed Ibrahim
Ahmed Ibrahim

Reputation: 751

Does make an object from another class inside a method considered composition

If I have this class

import java.util.Scanner;

public class SimpleCalc {

    private int x;
    private int y;
    private Scanner scan;

    public SimpleCalc() {
        scan = new Scanner(System.in);

        System.out.print("Please Enter The First Number: ");
        this.x = scan.nextInt();
        System.out.print("Please Enter The Second Number: ");
        this.y = scan.nextInt();
    }

}

This class uses composition concept because it has "scan" object from another class "Scanner".

But what if I declared the "scan" object inside a method like this:

public SimpleCalc() {
    Scanner scan = new Scanner(System.in);

    System.out.print("Please Enter The First Number: ");
    this.x = scan.nextInt();
    System.out.print("Please Enter The Second Number: ");
    this.y = scan.nextInt();
}

Does that considered composition concept?

In another way: does composition concept applies to just classes or also applies to methods?

Upvotes: 0

Views: 367

Answers (1)

Armaiti
Armaiti

Reputation: 766

If your question is, in the context of design pattern and specifically related to Composite Design Patter, then the short answer is NO.

As GOF has described:

"Compose objects into tree structure to represent part-whole hierarchies.Composite lets client treat individual objects and compositions of objects uniformly".

So this doesn't apply for methods.

Upvotes: 1

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