Question

4. Command pattern
//class Stock

public class Stock {

    private String name;
    private double price;

    public Product(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public void buy(int quantity){
        System.out.println(“BOUGHT: “ + quantity + “x “ + this);
    }

    public void sell(int quantity){
        System.out.println(“SOLD: “ + quantity + “x “ + this);
    }

    public String toString() {
        return “Product [name=” + name + “, price=” + price + “]”;
    }

}

a. Create two command classes that allows the customer to buy and sold stocks.
b. Write a main method to test it.

5. Adapter pattern
//interface NameInterface
interface NameInterface {
public void setName(String n);

public String getName();
}

//Adaptee class
class SimpleName implements NameInterface {
String name;

public void setName(String n) {
name = n;
}

public String getName() {
return name;
}
}