How do I implement a factory pattern and creational pattern in java ? Illustrate with an example

Provide an example of method overriding in Python, and discuss how it facilitates polymorphism.

Create the UML Diagram for this java code import java.util.Scanner; interface Positive{    void Number();} class Square implements Positive{    public void Number() {        Scanner in=new Scanner(System.in);        System.out.println("Enter a number: ");        int a = in.nextInt();            if(a>0) {                System.out.println("Positive number");            }            else {                System.out.println("Negative number");            }            System.out.println("\nThe square of " + a +" is " + a*a);            System.out.println("\nThe cubic of "+ a + " is "+ a*a*a);    }} class Sum implements Positive{    public void Number() {        Scanner in = new Scanner(System.in);            System.out.println("\nEnter the value for a: ");            int a = in.nextInt();            System.out.println("Enter the value for b" );            int b= in.nextInt();            System.out.printf("The Difference of two numbers: %d\n", a-b);            System.out.printf("The…

Discuss design patterns such as the Singleton, Factory, and Observer patterns and their implementations.