第七次作业

1.有10个评委打分,(去掉一个最高一个最低)求平均分。

package learn;
import java.util.*;
public class learn1{
    public static void main(String[] args){
        Scanner s = new Scanner(System.in);
        double[] arry = new double[10];
        System.out.println("请输入10个评委的打分");
        for (int i = 0; i < 10; i++) {
            arry[i] = s.nextDouble();//分数
        }
        double temp = 0;
        for (int i = 0; i < arry.length; i++) {
            for (int j = 0; j < arry.length-i-1; j++) {
                if (arry[j]<arry[j+1]) {
                    temp = arry[j];
                    arry[j] = arry[j+1];
                    arry [j+1] = temp;
                }
            }
        }    
        arry[0]=0;
        arry[9]=0;
        double sum=0,pjs;
        for (int i = 0; i < arry.length; i++) {
            sum+=arry[i];
        }
        pjs=sum/8;
        System.out.println("他的平均分是"+pjs);

        }
}

2.自学一下Java随机数，生成一个长度为10的随机数组（每个数的范围是0~99），排序后输出。

package learn;
import java.util.*;
public class learn1{
    public static void main(String[] args){
        int ARRAYLENGTH = 10;
        int a[] = new int[ARRAYLENGTH];
        Random ran = new Random();
        for(int i = 0; i < a.length; i++){
            //Random类nextInt()方法产生随机数
            a[i] = ran.nextInt(99) + 1;
        }
        System.out.println("数组a为：" + Arrays.toString(a));
       
    }

}

3.制作彩票35选7程序。 （就是1~35随机生成7个不重复的数）

package learn;
import java.util.*;
public class learn1{
    public static void main(String[] args){
        List<Integer> reList = new ArrayList<Integer>();
        int[] num = new int[35];// 创建一个35长度的int数组
        boolean[] flag = new boolean[35];
        int count = 0;
        for (int i = 0; i < 35; i++)
        {
        num[i] = i + 1;
        flag[i] = true;
        }
        // 判断抓取到的数字够不够7个，不够的话，继续抓取
        while (count != 7) {
        int k = (int) (Math.random() * 35);
        if (flag[k]) {
        reList.add(num[k]);
        flag[k] = false;
        count++;
        }
        }
        // 抓取结束后输出抓取结果
        Object[] result = reList.toArray();
        System.out.print("[\t");
        for (int i = 0; i < result.length; i++) {
            System.out.print(result[i] + "\t");
        }
        System.out.print("]");


        }
}

4.定义一个长度为10的int数组,统计数组中的最大值、最小值、以及奇数和偶数的个数

package learn;
public class learn1{
    public static void main(String[] args){
        int[] num=new int[] {99,57,77,45,89,43,66,85,86,55};
        int max=num[0];
        int mini=num[0];
        int jishu=0;
        int oushu=0;
        for (int i = 1; i <num.length ; i++) {
            if (num[i]>max){
                max=num[i];
            }
        }
        for (int j = 1; j <num.length ; j++) {
            if (num[j]<mini){
                mini=num[j];
            }
        }
        for (int k = 0; k< num.length; k++) {
            if (num[k]%2==0){
                oushu+=1;
            }else {
                jishu+=1;
            }
        }
        System.out.println("最大值为"+max+ "最小值为"+mini+ "偶数有"+oushu+"个"+ "奇数有"+jishu+"个");

        }
}