声明一个Average接口，其中约定求平均值的方法；声明多个类实现

Average接口分别给出求平均值的方法实现。例如，在一组数值中，一种算法是全部数值相加后求平均值，另一种算法是，去掉一个最高分和一个最低分，再将总分求平均等。原始成绩以字符串数组的形式在程序中指定:

String s1[]={"67","80","88","82","90","91",}

String s2[]={"67","80","88a","85","a","91"}

用Integer.parseInt("98")转化成整形数据并检查数据格式是否正确-Average declare an interface by which the agreed averaging method　declare multiple classes implement Average interfaces are given averaging method. For example, in a set of values, an algorithm is the added value of all the average, another algorithm is to remove a highest and lowest points, and then averaging the other score. Raw scores in the form of an array of strings specified in the program: String s1 [] = {" 67" , " 80" , " 88" , " 82" , " 90" , " 91" ,}　String s2 [] = {" 67" , " 80" , " 88a" , " 85" , " a" , " 91" }　using Integer.parseInt (" 98" ) into integer data and checks the data in the correct format