java第七周课上练习

1.有10个评委打分,(去掉一个最高一个最低)求平均分。

package a;
import java.util.*;
public class ling {
    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
        }
        //对数组进行有大到小排序
        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;
                }
            }
        }    
        //遍历新数组
//        for (int i = 0; i < 10; i++) {
//            System.out.print(arry[i]);
//        }
        //让最大值最小值为0
        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 a;
import java.util.*;
public class ling {
    public static void main(String[] args) {
        // TODO Auto-generated method stub;
        Random r = new Random();
        int[] a = new int[10];
        System.out.println("随机生成数组为：");
        for (int j = 0; j < a.length; j++) {
        a[j] = r.nextInt(100);
        System.out.print(a[j] + " ");
        }
        System.out.println();
        int t = 0;
        for (int i = 0; i < a.length; i++) {
        for (int j = 0; j < a.length - i - 1; j++) {
        if (a[j] > a[j + 1]) {
        t = a[j];
        a[j] = a[j + 1];
        a[j + 1] = t;
        }
        }
        }
        System.out.println("数组排序后为：");
        for (int j = 0; j < 10; j++) {
        System.out.print(a[j] + " ");
        }
        }
        }

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 a;
import java.util.*;
public class ling {
public static void main(String[] args) {
// TODO Auto-generated method stub;
Random r = new Random();
int[] a = new int[7];
System.out.println("随机生成号码为：");
int t = 0;
fuck: for (int i = 0; i < a.length; i++) {
a[i] = r.nextInt(35) + 1;
t = a[i];
for (int j = 0; j < i; j++) {
if (a[j] == t) {
i--;
continue fuck;
}
}
}
for (int i = 0; i < a.length; i++) {
System.out.print(a[i] + " ");
}
}
}

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 a;
import java.util.*;
public class ling {
    public static void main(String[] args) {
        // TODO Auto-generated method stub;
        Random r = new Random();
        int[] a = new int[10];
        System.out.println("随机生成数组为：");
        for (int j = 0; j < a.length; j++) {
        a[j] = r.nextInt(100);
        System.out.print(a[j] + " ");
        }
        System.out.println();
        int max = 0, min = 0, ji = 0, ou = 0;
        for (int i = 1; i < a.length; i++) {
        if (a[i] > max) {
        max = a[i];
        }
        }
        for (int i = 1; i < a.length; i++) {
        if (a[i] < min) {
        min = a[i];
        }
        }
        for (int i = 0; i < a.length; i++) {
        if (a[i] % 2 == 0) {
        ou += 1;
        } else {
        ji += 1;
        }
        }
        System.out.println("最大值为" + max);
        System.out.println("最小值为" + min);
        System.out.println("偶数有" + ou + "个");
        System.out.println("奇数有" + ji + "个");
        }
        }