Thingking In Java里一个对象构造顺序和向上转型的有关问题

结果：（我怎么理解的是注释的结果啊）Frog swimFrog speakFrog eatFrog growFrog eat            //Amphibian eatAmphibian growFrog eat           // Amphibian eatimport static org.greggordon.tools.Print.*;class Amphibian {    protected void swim() {        println("Amphibian swim");    }    protected void speak() {        println("Amphibian speak");    }    void eat() {        println("Amphibian eat");    }    static void grow(Amphibian a) {        println("Amphibian grow");        a.eat();    }}public class Frog17 extends Amphibian {    @Override protected void swim() {        println("Frog swim");    }    @Override protected void speak() {        println("Frog speak");    }    @Override void eat() {        println("Frog eat");    }    static void grow(Amphibian a) {        println("Frog grow");        a.eat();    }    public static void main(String[] args) {        Frog17 f = new Frog17();        // call overridden base-class methods:        f.swim();        f.speak();        f.eat();        // upcast Frog17 to Amphibian argument:        f.grow(f);                   //调导出类的方法，f向上转型为基类型，然后导出类中a.eat（）是不是应该调基类的eat（）啊        // upcast Frog17 to Amphibian and call Amphibian method:        Amphibian.grow(f);//调基类方法，参数向上转型基类型，然后a.eat()不应该是掉基类的eat么    }}

import static org.greggordon.tools.Print.*;class Component1 {    Component1() { println("Component1()"); }}class Component2 {    Component2() { println("Component2()"); }}class Component3 {    Component3() { println("Component3()"); }}class Root {    Component1 c1root=new Component1() ;    Component2 c2root;    Component3 c3root;    Root() { println("Root()"); }}class Stem extends Root {    Component1 c1stem;    Component2 c2stem=new Component2();    Component3 c3stem;    Stem() { println("Stem()"); }    public static void main(String[] args) {        Stem s = new Stem();    }}