Phone基类：
package ven;public class Phone {public Phone(){}public void call(String name){System.out.println("给"+name+"打电话");}
}

AIPhone子类：

package ven;public class AIPhone extends Phone{@Override //重载注解，提示校验子类重写父类call()方法public void call(String name) {//用super关键字调用父类的call()方法，不用再复制父类同样方法super.call(name);//子类独有的扩展功能描述System.out.println("同时开启视频功能……");}
}

测试类：

package ven;public class Test {public static void main(String[] args) {AIPhone iP= new AIPhone();iP.call("张三");}
}