package liuting1;

public class InheritenceTest3
{
           public static void main(String[]agrs)
           {
                  Son son = new Son();   //为什么总这个地方有问题呢？想不通。   
           }
}
class Grandpa
{
       public Grandpa()
       {
              System.out.println("Grandpa");
       }
}
class Father extends Grandpa
{
       public Father()
        {
              System.out.println("Father");
        }
}
class Son extends Father
{
        public Son()
        {
              System.out.println("Son");
         }
}  
帮忙瞧瞧了..新新人类...谢谢！

要使用你要先import这个类

万分感谢了  是的。