1.类的类成员的类中要有默认构造参数
2.构造顺序
当类对象作为类的成员时，构造顺序是先依次构造类成员的构造，然后再构造自己
3.析构顺序
析构与构造相反，先析构自己，再以相反顺序依次析构成员
#define _CRT_SECURE_NO_WARNINGS #include <iostream> #include <string> using namespace std; class Game { public: Game() { cout << "Game无参构造函数" << endl; } Game(string name) { m_name = name; cout << "Game有参构造函数" << endl; } ~Game() { cout << "Game析构函数" << endl; } string m_name; }; class Phone { public: Phone() { cout << "Phone无参构造函数" << endl; } Phone(string name) { m_name = name; cout << "Phone有参构造函数" << endl; } ~Phone() { cout << "Phone析构函数" << endl; } string m_name; }; class Person { public: Person() { cout << "Person无参构造函数" << endl; } Person(string name) { m_name = name; cout << "Person有参构造函数" << endl; } ~Person() { cout << "Person析构函数" << endl; } string m_name; Phone m_Phone; //Phone和Game谁在前面先构造谁，跟类位置无关 Game m_Game; }; void Test201() { Person p1; } int main() { Test201(); system("Pause"); return 0; }
结果：
案例：
#define _CRT_SECURE_NO_WARNINGS #include <iostream> #include <string> using namespace std; class Game { public: Game() { cout << "Game无参构造函数" << endl; } Game(string name) { m_name = name; cout << "Game有参构造函数" << endl; } ~Game() { cout << "Game析构函数" << endl; } string m_name; }; class Phone { public: Phone() { cout << "Phone无参构造函数" << endl; } Phone(string name) { m_name = name; cout << "Phone有参构造函数" << endl; } ~Phone() { cout << "Phone析构函数" << endl; } string m_name; }; class Person { public: Person() { cout << "Person无参构造函数" << endl; } Person(string name, string phoneName, string gameName):m_name(name),m_Phone(phoneName),m_Game(gameName) //需要类Phone和类Game有有参构造函数，不然报错 { m_name = name; cout << "Person有参构造函数" << endl; } ~Person() { cout << "Person析构函数" << endl; } string m_name; Phone m_Phone; //Phone和Game谁在前面先构造谁，跟类位置无关 Game m_Game; void PlayGame() { cout << m_name << "使用《" << m_Phone.m_name << ">>玩着《" << m_Game.m_name << "》游戏" << endl; } }; void Test201() { Person p1("张三", "华为", "漫威"); p1.PlayGame(); } int main() { Test201(); system("Pause"); return 0; }
结果：