Notes
Notes - notes.io |
package facadepattern;
public class FacadePatternDemo {
public static void main(String[] args) {
ShapeMaker shapeMaker = new ShapeMaker();
System.out.println("Using ShapeMaker to draw shapes:");
shapeMaker.drawCircle();
shapeMaker.drawRectangle();
shapeMaker.drawSquare();
}
}
interface Shape {
void draw();
}
class Circle implements Shape {
public void draw() {
System.out.println("Circle::draw()");
}
}
class Square implements Shape {
public void draw() {
System.out.println("Square::draw()");
}
}
class Rectangle implements Shape {
public void draw() {
System.out.println("Rectangle::draw()");
}
}
class ShapeMaker {
private final Shape circle = new Circle();
private final Shape rectangle = new Rectangle();
private final Shape square = new Square();
public void drawCircle() {
circle.draw();
}
public void drawRectangle() {
rectangle.draw();
}
public void drawSquare() {
square.draw();
}
}
………
Command
package commandpattern;
import java.util.ArrayList;
import java.util.List;
public class RestaurantOrderSystem {
public static void main(String[] args) {
Chef chef = new Chef();
Waiter waiter = new Waiter();
waiter.takeOrder(() -> chef.makeBurger());
waiter.takeOrder(() -> chef.makePizza());
waiter.submitOrders();
}
}
class Chef {
public void makeBurger() {
System.out.println("Chef is making a burger.");
}
public void makePizza() {
System.out.println("Chef is making a pizza.");
}
}
interface Command {
void execute();
}
class Waiter {
private List<Command> orders = new ArrayList<>();
public void takeOrder(Command command) {
orders.add(command);
}
public void submitOrders() {
orders.forEach(Command::execute);
orders.clear();
}
}
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