java中静态数据成员加上关键字static如何举例？

//示例 #include

using namespace std;

class Myclass

{

public:

    Myclass(int a, int b, int c);

    void GetSum();

private:

    int a;

    int b;

    int c;

    static int Sum;//声明静态数据成员

};

int Myclass::Sum = 0;//定义并初始化静态数据成员

Myclass::Myclass(int a,int b,int c)

{ this->a = a;

this->b = b;

this->c = c;

Sum += a + b + c;

}

void Myclass::GetSum()

{

cout<<"Sum="<<Sum<<endl;

}

int main()

{

Myclass M(1, 2, 3);

M.GetSum();

Myclass N(4, 5, 6);

N.GetSum();

M.GetSum();

}