如果要实现某个接口的方法,需要先implements接口。如:public class User1 implements User{};之后在User1类中重新再test方法中编写相应的方法代码即可。备注:接口中是没有方法实现的,之后接口定义,之后在子类中进行具体的方法实现,并且子类必须实现父类的所有方法。
public class interfaceDemo { public static void main(String[] args) {Vehicle v1 = new Aircratf();v1.start(10);v1.stop();
Vehicle v2 = new Bus();v2.start(2)
public class Aircraft implements Vehicle{private int speed;public Aircraft(){}public void setSpeed(int speed){this.speed=speed;}public int getSpeed(){return this.spee