按照闵老师的教程，今天是一个综合任务。随机生成学生成绩，并找出成绩最好、最差的同学，挂科的同学不参加评比。原博客地址：https://blog.csdn.net/minfanphd/article/details/116933803

package basic;

import java.util.Arrays;
import java.util.Random;

/**
 * 
 * This is the tenth code, also the first task.
 * 
 * @author WX873
 *
 */
public class Task1 {
	/**
	 * ***********************************************
	 * The entrance of the program.
	 * 
	 * @param args Not used now.
	 */
	public static void main(String args[]) {
		task1();
	}//of main
	
	/**
	 * ********************************************
	 * Method unit test.
	 * ********************************************
	 */
	public static void task1() {
		//Step 1. Generate the data with n students and m courses.
		//Set these value by yourself.
		 int n = 10;
		 int m = 3;
		 Random tempRandom = new Random();
		 int upperBound = 100;
		 int lowerBounder =50;
		 int threshold = 60;
		 int[][] data = new int[n][m];
		 for (int i = 0; i < n; i++) {
			for (int j = 0; j < m; j++) {
				data[i][j] = lowerBounder + tempRandom.nextInt(upperBound - lowerBounder);
			}//of for j
		}//of for i
		 
		 System.out.println("The data is :\r\n" + Arrays.deepToString(data));
		 
		 //Step 2. Compute the total score of each student.
		 int[] tempResult = new int[n];
		 for (int i = 0; i < n; i++) {
			for (int j = 0; j < m; j++) {
				if (data[i][j] < threshold) {
					tempResult[i] = 0;
					break;
				}//of if
				tempResult[i] += data[i][j]; 
			}//of for j
		}//of for i
		 
		 System.out.println("The total score are :\r\n" + Arrays.toString(tempResult));
		 
		 //Step 3. Find the best and worst student.
		 int tempBestIndex = -1;
		 int tempWorstIndex = -1;
		 int BestScore = 0;
		 int WorstScore = m * upperBound + 1;
		 for (int i = 0; i < n; i++) {
			if (tempResult[i] == 0) {
				continue;
			}//of if
			if (tempResult[i] > BestScore) {
				BestScore = tempResult[i];
				tempBestIndex = i;
			}//of if
			if (tempResult[i] < WorstScore) {
				WorstScore = tempResult[i];
				tempWorstIndex = i;
			}//of if
		}//of for i
		 
		 if (tempBestIndex == -1) {
			System.out.println("Cannot find best student. All students have failed.");
		}else {
			System.out.println("The best student is No." + tempBestIndex + " with score:" + BestScore);
		}//of if
		 
		 if (tempWorstIndex == -1) {
			 System.out.println("Cannot find worst student. All students have failed.");
		} else {
			System.out.println("The worst student is No." + tempWorstIndex + " with score:" + WorstScore);
		}//of if

	}//of task1

}//of Task1

这次新学了生成随机数，就是random（）方法。随着学习，不断觉得代码的合理性自己还不能把握住。练习本篇博客内容的时候，先看了一遍程序，然后自己试着写。初始化的时候原程序worstScore = m*upperBound + 1,自己写的时候初始化为0了。虽然对程序没啥影响，但是想了一下还是原来的更合理些。最大值初始值设为最小，最小值的初始值设为最大。这里只是举了一个例子，还有原博客中将upperBound设置为65去找bug，为啥会想到去这么做？包括挂科的同学，总成绩直接为零，这个地方，一看到就恍然大悟，自己在没看代码的时候没想到。