类的执行顺序
package com.payton.polymorphism;class Meal { Meal(){ System.out.println("Meal()"); }}class Bread { Bread(){ System.out.println("Bread()"); }}class Cheese { Cheese(){ System.out.println("Cheese()"); }}class Lettuce { Lettuce(){ System.out.println("Lettuce()"); }}class Lunch extends Meal { private Bread b = new Bread(); Lunch(){ System.out.println("Lunch()"); }}class PortableLunch extends Lunch { PortableLunch(){ System.out.println("PortableLunch()"); }}public class Sandwich extends PortableLunch{ private Bread b = new Bread(); private Cheese c = new Cheese(); private Lettuce l = new Lettuce(); public Sandwich(){ System.out.println("Sandwich()"); } public static void main(String[] args) { new Sandwich(); }}Meal()Bread()Lunch()PortableLunch()Bread()Cheese()Lettuce()Sandwich()
调用顺序：
1、调用基类的构造函数。（先创建根，下一级派生类，....直到最后一个继承类的构造函数）
2、成员对象按照其声明顺序进行初始化。
3、执行继承类的构造函数。
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