构造函数的执行顺序

http://soft6.com/tech/4/46644.html

构造一个类时，它的父类和成员变量所属类的构造函数都会被自动执行

程序：

public class Test {
 public static void main(String[] args) {
  Child child = new Child();
 }
}

class Parent {
 Parent() {
  System.out.println("to construct Parent.");
 }
}

class Child extends Parent {
 Child() {
  System.out.println("to construct Child.");
 }

 Delegatee delegatee = new Delegatee();
}

class Delegatee {
 Delegatee() {
  System.out.println("to construct Delegatee.");
 }
}
运行结果：

to construct Parent.
to construct Delegatee.
to construct Child.