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class Base
{
public:
 Base()
 {
  init(); 
 }
 virtual ~Base() {}
protected:
 int value;
 virtual void init() 
 { 
  value = 100;     
 }
};
class Derived : public Base
{
public:
 Derived()
 {
  init();
 }
protected:
 void init() 
 {
  cout << "value = " << value << endl;
  // ×öһЩ¶îÍâµÄ³õʼ»¯¹¤×÷ 
 }
};
int main(int argc, char* argv[])
{
 Base* pb;
 pb = new Derived();
 delete pb;
 return 0;
}
Ö´Ðнá¹ûÊÇ
value = 100
ÔÙ¿´java´úÂ룺
class Base
{
  public Base()
  {
    init();
  }
  protected int value;
  protected void init()
  {
         value = 100;  
  }
}
class Derived extends Base
{
  public Derived()
  {
    init();
  }
  protected void init()
  {
    System.out.println("value = " + value);
    // ×öһЩ¶îÍâµÄ³õʼ»¯¹¤×÷
  }
}
public class Test
{
  public static void main(String[] args)
  {
    Base base = new Derived();
  }
}
Ö´Ðнá¹ûÊÇ
value = 0
value = 0
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