SupeDemo关键字的演示

package oo.day04;
//super演示
public class SuperDemo {
    public static void main(String[] args) {
        Boo o = new Boo();
    }
}

class Coo{
    int c;
    Coo(int c){
        this.c = c;
    }
}
class Doo extends Coo{
    Doo(){
        super(2);
    }
    
    
    /*
    //如下代码为默认生成的代码，写不写都在那
    Doo(){
        super();
    }
    */
}












class Aoo{
    int a;
    Aoo(){
        System.out.println("父类构造");
    }
}
class Boo extends Aoo{
    int b;
    Boo(){
        //super(); //默认，写不写都在那
        System.out.println("子类构造");
        //super(); //编译错误，必须位于子类构造的第1句
    }
}