1、使用java语言编程，从键盘输入N个整数存储到数组中，求数组所有元素的和、最大值和平均值。

import java.util.Scanner;

public class Program01{

public static void main(String [] args)

{

Scanner scanner = new Scanner(System.in);

System.out.println("qing shu ru shu zi ge shu: ");

int number = scanner.nextInt();

int[] scores = new int[number];

for(int i = 0;i

scores[i] = scanner.nextInt();

}

int maxScore=scores[0];

for(int i=0;i

if(maxScore

maxScore=scores[i];

}

}

System.out.println("zui da zhi: "+maxScore);

int minScore=scores[0];

for(int i=0;i

if(minScore>scores[i]){

minScore=scores[i];

}

}

System.out.println("zui xiao zhi: "+minScore);

int sum=0;int avg=0;

for(int i=0;i

sum+=scores[i];

}

avg=sum/scores.length;

System.out.println("pin jun zhi: "+avg);

}

}

2、使用java语言编程，产生一万个一到九之间的随机数，统计每个数出现的概率。

import java.util.Random;

public class Program02 {

public static void main(String[] args) {

int[] times = new int[9];

int n = 10000;

Random r= new Random();

for (int i = 0; i < n; i++) {

int num = r.nextInt(9)+1;

times[num - 1] = times[num - 1] + 1;

}

for (int i = 0; i < times.length; i++) {

System.out.println((i + 1) + "chu xian de ci shu: " + times[i]);

}

}

}

3、使用java语言编程，从键盘输入10个整数，并存放到一个数组中，然后将其前面五个元素与后面五个元素对换，即：第一个元素与第十个元素互换，第二个元素和第九个元素互换，... ...，第五个元素和第六个元素互换。分别输出数组原来各元素和互换后的各元素的值。

public class Program03{

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

int [] num=new int [10];

for(int i=0;i<10;i++){

num[i]=scanner.nextInt();

}

int [] num1=new int[num.length];

for(int i=0;i

num1[i]=num[i];

}

for(int i=0;i

int temp = num[i];

num[i]=num[num.length-i-1];

num[num.length-i-1]=temp;

}

for(int i=0;i

System.out.print(num1[i]+"\t");

}

System.out.print("\r\n");

for(int i=0;i

System.out.print(num[i]+"\t");

}

}

}