如何消除平行类/继承层次结构？

Question

鉴于

Sportman

abstract class Sportman
{
    public abstract function run();
}

class Soccer extends Sportman
{
    public function run()
    {
        // soccer running
    }
}

class Tennisplayer extends Sportman
{
    public function run()
    {
        // tennisplayer running (jumping)
    }
}

现在他们都有目标了，所以

abstract class Goals
{
    public abstract function hit();
}

class Runner extends Goals
{
    public function hit()
    {
        // kick a ball and score a goal
    }
}

class Tennisplayer extends Goals
{
    public function run()
    {
        // hit back the ball so that his opponent wont be able to return
    }
}

现在这里是层次结构。每当添加新的

Sportman

时，也应添加新的

Goals

。 我们可以尝试将层次结构合并为一个：

abstract class Sportman
{
    public abstract function run();
    public abstract function hit();
}

class Runner extends Sportman
{
    public function run()
    {
        // sportman running
    }

    public function hit()
    {
        // kick a ball and score a goal
    }
}

class Tennisplayer extends Sportman
{
    public function run()
    {
        // tennisplayer running (jumping)
    }

    public function run()
    {
        // hit back the ball so that his opponent wont be able to return
    }
}

但我真的不认为它在这里起作用，因为随着时间的推移，这些类变成了一个“包”，有很多方法和很多依赖项。还有其他想法吗？