接口与实现：实验1

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接口：

package mypackage;public interface computerAverage {public abstract double average(double x[]);}

接口实现：

package mypackage;public class Gymnastics implements computerAverage {@Overridepublic double average(double[] x) {// TODO 自动生成的方法存根double average=0;int k= x.length;for(int i=1; i<k; i++){double temp;if(x[i-1]>x[i]){temp=x[i-1];x[i-1]=x[i];x[i]=temp;}}k--;for(int i=1; i<k; i++){average+=x[i];}k--;if(k > 2)average/=k;else average=0;return average;}}

package mypackage;public class School implements computerAverage {@Overridepublic double average(double[] x) {// TODO 自动生成的方法存根double average=0;int k= x.length;for(int i=0; i<k; i++){average+=x[i];}if(k > 2)average/=k;else average=0;return average;}}

主类：

package Main;import mypackage.*;public class main_class {public static void main(String[] args) {// TODO 自动生成的方法存根double a[] ={ 9.89, 9.88, 9.99, 9.12, 9.69,      9.76, 8.97};double b[] ={ 89, 56, 78, 90, 100, 77, 56, 45,      36, 79, 98};computerAverage k=new School();System.out.println("学校平均分："+k.average(a));k=new Gymnastics();System.out.println("选手平均分："+k.average(b));}}

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