По дебаггеру, сначала запускается: new RunnableImpl new DecoratorMyRunnableImpl new DecoratorRunnableImpl а вывод: DecoratorRunnableImpl body 1 DecoratorMyRunnableImpl body 2 RunnableImpl body 3 Почему так?
public class Solution {

    public static void main(String[] args) {
        new Thread(new DecoratorRunnableImpl(new DecoratorMyRunnableImpl(new RunnableImpl()))).start();
    }

    public static class RunnableImpl implements Runnable {
        @Override
        public void run() {
            System.out.println("RunnableImpl body 3 ");
        }
    }

    public static class DecoratorRunnableImpl implements Runnable {
        private Runnable component;

        public DecoratorRunnableImpl(Runnable component) {
            this.component = component;
        }

        @Override
        public void run() {
            System.out.print("DecoratorRunnableImpl body 1 ");
            component.run();
        }
    }
    public static class DecoratorMyRunnableImpl implements Runnable {
        private Runnable component;

        public DecoratorMyRunnableImpl(Runnable component) {
            this.component = component;
        }

        @Override
        public void run() {
            System.out.print("DecoratorMyRunnableImpl body 2 ");
            component.run();
        }
    }

}