test3.java

学习java编程的好程序

public class test3
{
    public static void main(String[] args)
    {
         B b=new B();
         C.t(b);
}
}
class A
{
    public void t1()
{
        System.out.println("this is class A t1");
}
}
class B extends A
{
    public void t1()
   {
        System.out.println("this is class B t1");
}
   public void t2()
   {
        System.out.println("this is class B t2");
}
}
class C
{
    public static void t (A a)
   {
        a.t1();
   }   

}