【玩转23种Java设计模式】结构型模式篇：装饰者模式

public abstract class Component {
    public abstract void operate();
}

public class ConcreteComponent extends Component {
    @Override
    public void operate() {
        System.out.println("应该做一些事情");
    }
}

public class Decorator extends Component {
    private Component component = null;
    
    public Decorator(Component component){
        this.component = component;
    }

    @Override
    public void operate() {
        this.component.operate();
    }
}

public class ConcreteDecorator extends Decorator {
    public ConcreteDecorator(Component component){
        super(component);
    }

    private void method(){
        System.out.println("修饰方法执行了");
    }

    @Override
    public void operate() {
        this.method();
        super.operate();
    }
}

public class Main {
    public static void main(String[] args) {
        Component component = new ConcreteComponent();
        component = new ConcreteDecorator(component);
        component.operate();
    }
}

修饰方法执行了
应该做一些事情