public class educoder06{

• final标记的类不能被继承；

• final标记的方法不能被子类复写；

• final标记的变量（成员变量或局部变量）即为常量，只能赋值一次

public class educoder06{
    public static void main(String args[]){
        Bike1 obj = new Bike1();
        obj.run();

        Honda honda = new Honda();
        honda.run();

        Yamaha yamaha = new Yamaha();
        yamaha.run();
    }
}

class Bike1 {
    int speedlimit = 90;

    void run() {
        speedlimit = 120; 
        System.out.println("speedlimit=120");
    }
}

class Bike2 {
    void run() {
        System.out.println("running");
    }
}

class Honda extends Bike2 {
    void run() { 
        System.out.println("running safely with 100kmph");
    }
}

class Bike3 {
}

class Yamaha extends Bike3 { 
    void run() {
        System.out.println("running safely with 100kmph");
    }
}
 

测试结果：

speedlimit=120
running safely with 100kmph
running safely with 100kmph