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    É裺gunΪ¸¸À࣬shootgunºÍpistolΪgunµÄ×ÓÀà¡£
    Java:
    class gun {
        void shoot() {
            System.out.println("gun shoot");
        }
    }
    class shootgun extends gun {
        void shoot() {
            System.out.println("shootgun shoot");
       }
    }
    class pistol extends gun {
       void shoot() {
            System.out.println("pistol shoot");
        }
    }
    C++:
    class gun
    {
        void shoot()
        {
            cout << "gun shoot" << endl;
        }
    };
    class shootgun : gun
    {
        void shoot()
        {
            cout << "shootgun shoot" << endl;
        }
    };
    class pistol : gun
    {
        void shoot()
        {
            cout << "pistol shoot" << endl;
      &n


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