public class T{
    public static void main(String args[]){
        T1 t1 = new Impl2();//这个地方为什么不写T1 t1 = new T1();它不是应该调T1的构造方法吗？
        
        T t = new T();
        t.t1(t1);
        
    }
   
   
    public void t1(T1 t){
        String s = t.writeZy("");
        System.out.println(s);
    }
}

abstract class P implements T1{
    private int conn(){
        return 5;
    }
}

class Impl extends P {
   
    public String writeZy(String tm){
        return "My Impl";
    }
    public void  a(){
        System.out.println("aaaaaaaaaaaa");
    }
}
class Impl2 extends P{
   
    public String writeZy(String tm){
        return "My Impl222";
    }
   
}

interface T1{   
     public static final int A_HEIGHT = 10;
     
     String writeZy(String tm);
}
interface T2{
    public void a();
}