构造函数（构造器）的调用顺序

package demo2;


class Meal {
Meal(){
System.out.println("Meal()");
}
}


class Bread {
Bread(){
System.out.println("Bread()");
}
}


class Cheese {
Cheese(){
System.out.println("Cheese()");
}
}


class Lettue {
Lettue(){
System.out.println("Lettue()");
}
}


class Lunch extends Meal {
Lunch(){
System.out.println("Lunch()");
}
}


class PortableLunch extends Lunch {
PortableLunch(){
System.out.println("PortableLunch()");
}
}


public class demo1 extends PortableLunch {
private Bread bread = new Bread();
private Cheese cheese = new Cheese();
private Lettue lettue = new Lettue();
public demo1(){
System.out.println("demo1()");
}
public static void main(String[]args){
new demo1();
}

}

打印结果：

Meal()
Lunch()
PortableLunch()
Bread()
Cheese()
Lettue()
demo1()

分析： 运行，进入demo1类的main方法，需要进行demo1的构造（生成），首先去调用基类的构造器，反复递归下去，然后初始化类中的成员，最后调用用户定义的demo1的构造方法.

补充：销毁顺序和构造顺序相反，就像资源的打开顺序和关闭顺序。