一个笔试题,1000份卷子随机抽取100份,其中一种java解法

题目:1.假设有一个题库,里面存放着1000道题目(题型都一样)现在我们要从这题库里,随机抽取100道不同的题生成一张考卷请描述你的思路,选出题号(整数)即可

贴上解法,这种思路是通过产生一个对照随机数组,然后对随机数数组排序进而将原试卷数组顺序打乱,最后取出前100道题目,而这100道是完全随机的!当然也有简单的解法,这只是一个稍微复杂的想法,纯属写着玩!

public class Test {
    public static void main(String... args) {
        Test test = new Test();
        int [] paperIds = test.getPaperID();
        System.out.println("试卷编号:"+Arrays.toString(paperIds));

        int [] randomArrays = test.getRandomArray();
        System.out.println("对照组随机数编号:"+Arrays.toString(randomArrays));

        int[] randomPapers = new int[100];


        int temp =0;
        int atemp = 0;
        for (int i = 0; i < randomPapers.length; i++) {
            for (int j = 0; j < randomPapers.length-i-1; j++) {
                if (randomArrays[i]>randomArrays[j]) {
                    temp = randomArrays[j];
                    randomArrays[j] = randomArrays[i];
                    randomArrays[i] = temp;
                    //对随机数组排序的时候也就打乱了试卷的顺序。保证了试卷的完全随机
                    atemp = paperIds[j];
                    paperIds[j] = paperIds[i];
                    paperIds[i] = atemp;
                }

            }
        }
        System.out.println(Arrays.toString(randomArrays));
        System.out.println(Arrays.toString(paperIds));
        for (int i = 0; i < randomPapers.length; i++) {
            randomPapers[i] = paperIds[i];
        }
        System.out.println("最后筛选出的卷子编号:"+Arrays.toString(randomPapers));
    }

    //获取卷子的数组
    private int[] getPaperID(){
        int temp[] = new int[1000];
        for (int i = 1; i < temp.length+1; i++) {
            temp[i-1] = i;
        }
        return temp;
    }
    //随机一个跟卷子数组一样长度的数组
    private int[] getRandomArray(){
        int temp[] = new int[1000];
        for (int i = 0; i < temp.length; i++) {
            temp[i] = new Random().nextInt(99999999);
        }
        return temp;
    }

}
最后附上结果:

猜你喜欢

转载自blog.csdn.net/zhang1223665986/article/details/80797466
今日推荐