java的构造

public class HippoTest {
    public static void main(String[] args) {
        Hippo h = new Hippo();
    }
}

class Animal {
    int a = 10;
    private int k = 6;
    protected int m = 10;
    public int y = 100;
    Animal(){
        System.out.println("mark Animal");
    }
}

class Hippo extends Animal{
    Hippo(){
        System.out.println("mark Hippo");
        System.out.println("a:"+a+"m:"+m+"y"+y);
    }
}