在Java中如何定义接口与实现类_OOP接口实现操作技巧

public interface Vehicle {
    // 抽象方法（无需 abstract 关键字）
    void start();
    void stop();
    
    // 默认方法（Java 8+）
    default void honk() {
        System.out.println("Beep beep!");
    }
}

public class Car implements Vehicle {
    @Override
    public void start() {
        System.out.println("Car engine started.");
    }

    @Override
    public void stop() {
        System.out.println("Car engine stopped.");
    }
}

public interface Flyable {
    void fly();
}

public class Airplane implements Vehicle, Flyable {
    public void start() {
        System.out.println("Airplane engine warming up.");
    }
    
    public void stop() {
        System.out.println("Airplane landed and stopped.");
    }

    public void fly() {
        System.out.println("Airplane is flying at 10,000 meters.");
    }
}

Vehicle v = new Car();
v.start(); // 输出：Car engine started.

v = new Airplane();
v.start(); // 调用Airplane的start方法
v.honk();  // 调用默认方法