java 接口 interface

interface A{
public String AUTHER="Mihchael";
public void print();
public String getInfo();
}
interface B{
public void say();
}
class X implements A,B{
public void say(){
System.out.println("Hello,World!!");
}
public void print(){
System.out.println("作者："+AUTHER);
}
public String getInfo(){
return "Hello";
}
}
public class test1 {
public static void main(String args[]){
X x=new X();
x.print();
x.say();
}
}