实验二：数组实验目的熟练掌握 Java语言一维数组的声明、初始化和元素的引用。熟练掌握 Java语言多维数组的声明、初始化和元素的引用。熟练掌握循环结构在数组中的应用。实验内容计算10个数中的最大、最小值计算10个数的均值mean和标准差deviation 计算今天是星期几计算矩阵的外围元素之和，主对角线元素之和以及副对角线元素之和实验步骤（流程图、类图和源代码）第一题: public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int[] x = new int[10]; for(int i = 0; i < x.length; i++) { x[i] = in.nextInt(); } in.close(); int max = x[0]; int min = x[0]; int maxi = 0; int mini = 0; for(int i = 0; i < x.length; i++) { if(max < x[i]) { max = x[i]; maxi = i; } if(min > x[i]) { min = x[i]; mini = i; } } System.out.println(max + " " + maxi); System.out.println(min + " " + mini); } } ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1271340-20200611-1591855767382) 2.第二题: public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); double[] x = new double[10]; double mean = 0; double deviation = 0; for(int i = 0; i < x.length; i++) { x[i] = in.nextDouble(); mean += x[i]; } in.close(); mean /= x.length; for(int i = 0; i < x.length; i++) { deviation += Math.pow(x[i] - mean, 2); } deviation = Math.sqrt(deviation / (x.length - 1)); System.out.printf("%.2f\n%.2f", mean, deviation); } } ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1271340-20200611-1591855771588) 3.第三题: public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int[][] x = new int[8][2]; for(int i = 0; i < 8; i++) { for(int j = 0; j < 2; j++) { x[i][j] = in.nextInt(); } } in.close(); for(int i = 1; i <= 7; i++) { int n = 0; for(int j = 0; j < 8; j++) { if((x[j][0] == i && x[j][1] == i) || (x[j][0] != i && x[j][1] != i)) { n++; } } if(n == 8) { System.out.println(i); } } } } ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1271340-20200611-1591855777111) 4.第四题: public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int[][] x = new int[4][4]; for(int i = 0; i < 4; i++) { for(int j = 0; j < 4; j++) { x[i][j] = in.nextInt(); } } in.close(); int a = 0; int b = 0; int c = 0; for(int i = 0; i < x.length; i++) { for(int j = 0; j < x.length; j++) { if(i == 0 || i == x.length - 1 || j == 0 || j == x.length - 1) { a += x[i][j]; } if(i == j) { b += x[i][j]; } if(i + j == x.length - 1){ c += x[i][j]; } } } System.out.println(a); System.out.println(b); System.out.println(c); } } ![图片描述](https://dn-simplecloud.shiyanlou.com/courses/uid1271340-20200611-1591855782313) 1.分析与思考

“Java程序设计（2020）”实验报告