package demo05;
//子类可以同时继承一个类并实现一个接口
public class ClassA extends ClassB implements InterfaceA{
}
-----------------------
package demo05;
public class ClassB {
}
--------------------
package demo05;
public interface InterfaceA {
}
原文：https://www.cnblogs.com/Koma-vv/p/9601927.html