程序如下: interface Er{ double PI=3.14;void tongdian(); void duandian(); } class Dfqc implements Er{ public void tongdian(){System.out.println("通电函数"+PI);} public void duandian(){} public void duan(){} } public classTest{ public static void main(String[]args){ Dfqc t=new Dfqc(); t.tongdian(); } } 分析上面的程序,下面描述错误的是: