Java フレームワークで一般的に使用されるデザイン パターンは何ですか?

public class Singleton {
    private static Singleton instance;
 
    private Singleton() {
        // Private constructor to prevent external instantiation
    }
 
    public static Singleton getInstance() {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }
}

public interface ShapeFactory {
    Shape createShape(String type);
}

public class CircleFactory implements ShapeFactory {
    @Override
    public Shape createShape(String type) {
        if (type.equals("CIRCLE")) {
            return new Circle();
        } else {
            return null;
        }
    }
}

public interface PaymentStrategy {
    void pay(double amount);
}

public class CreditCardPaymentStrategy implements PaymentStrategy {
    @Override
    public void pay(double amount) {
        // Process credit card payment
    }
}

public class Shape {
    protected String color;
 
    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }
}

public class DecoratorShape extends Shape {
    protected Shape decoratedShape;
 
    public DecoratorShape(Shape decoratedShape) {
        this.decoratedShape = decoratedShape;
    }

    @Override
    public String getColor() {
        return decoratedShape.getColor();
    }
}

public class Service {
    public void doSomething() {
        // Perform some service
    }
}

public class ServiceProxy implements Service {
    private Service service;
 
    public ServiceProxy(Service service) {
        this.service = service;
    }

    @Override
    public void doSomething() {
        // Perform additional logic
        service.doSomething();
        // Perform additional logic
    }
}