package com.sf.day09.interfacepackage.impl; import com.sf.day09.interfacepackage.Car; import com.sf.day09.interfacepackage.Car2; public class Car2Impl implements Car2 { @Override public void run() { System.out.println("car2 run"); } @Override public void eat(Double money) { System.out.println("car2 eat"); } @Override public void back() { System.out.println(" car2 BACK"); } public static void main(String[] args) { Car2 car2 = new Car2Impl(); car2.back(); car2.eat(100.11); car2.run(); Car car = new Car2Impl(); car.start(); car.eat(1001.1); car.run(); Car2 car22 = (Car2) car; car22.back(); } }