1.有10个评委打分,(去掉一个最高一个最低)求平均分。

package lucky;

public class happy {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		   int a[] = {2,4,6,8,10,12,14,16,18,20};
		   int m = 0;
		   for(int i=0;i<10;i++){
		       for(int j=0;j<10;j++){
		        int n = 0 ;
		        if(a[i]>a[j]){
		            n=a[i];
		            a[i]=a[j];
		            a[j]=n;
		        }
		       }
		   }
		   a[0]=0;
		   a[9]=0;
		   for(int x=0;x<10;x++){
		       m=a[x]+m;
		   }
		   m=m/8;
		   System.out.println("平均分是:"+m);
	 }
} 

  

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 lucky;

import java.util.Random;

public class happy {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		          int[] a = new int[10];
		            Random r=new Random();
		            for (int i = 0; i < a.length; i++) {
		                a[i]=r.nextInt(100);
		            }
		            int t;
		            for (int i = 0; i < a.length - 1; i++) {
		                for (int j = 0; j < a.length-1-i; j++) {
		                    if (a[j + 1] > a[j]) {
		                        t = a[j];
		                        a[j] = a[j + 1];
		                        a[j + 1] = t;
		                    }
		                }
		            }
		            for (int i : a) {
		                System.out.println(i);
		            }

	        }
       } 

  

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 lucky;

import java.util.Random;

public class happy {

	public static void main(String[] args) {
		// TODO Auto-generated method stub		
		     int a[] = new int[7];
		     Random r = new Random();
		     for(int i=0;i<a.length;i++){
		         a[i] = r.nextInt(35)+1;
		     }for(int j=0;j<a.length;j++){
		         System.out.println(a[j]);
		     }
		  }
      }

  

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 lucky;

public class happy {

	public static void main(String[] args) {
		// TODO Auto-generated method stub		
		      int[] num = new int[]{2,4,6,8,11,12,15,16,19,20};
		      int numMax = num[0];
		      int numMin = num[0];
		      int numjs = 0;
		      int numos = 0;
		      for(int i=0;i<num.length;i++){
		          if(num[i]>numMax){
		              numMax=num[i];
		      }if(num[i]<numMin){
		          numMin=num[i];
		      }if(num[i]%2==0){
		          numos +=1;
		      }else{
		          numjs +=1;
		      }
		      }
		      System.out.println("数组的最大值为:"+numMax);
		      System.out.println("数组的最小值为:"+numMin);
		      System.out.println("数组的偶数个数为:"+numos);
		      System.out.println("数组的奇数个数为:"+numjs);
		  }
      }