一维数组的应用举例

案例1

从键盘读入学生成绩，找出最高分，并输出学生成绩等级

• 成绩>=最高分-10 等级为’A’
• 成绩>=最高分-20 等级为’B’
• 成绩>=最高分-30 等级为’C’
• 其余 等级为’D’

提示：先读入学生人数，根据人数创建int数组，存放学生成绩。

   public static void ScoreTest() {
        //提示输入学生人数
        System.out.println("请输入学生人数：");
        Scanner scanner = new Scanner(System.in);
        int cnt = scanner.nextInt();

        //根据输入人数定义数组
        int[] score = new int[cnt];
        //循环输入成绩
        int maxScore = 0;
        System.out.println("请输入 " + cnt + " 个学生成绩 ");
        for (int i = 0; i < score.length; i++) {
            score[i] = scanner.nextInt();
            //最大值
            if (maxScore < score[i]) {
                maxScore = score[i];
            }
        }
        //最大值
        System.out.println("最高分是 " + maxScore);

        //遍历数组，取出分级信息
        char grade;
        for (int i = 0; i < score.length; i++) {
            if (score[i] >= maxScore - 10) {
                grade = 'A';
            } else if (score[i] >= maxScore - 20) {
                grade = 'B';
            } else if (score[i] >= maxScore - 30) {
                grade = 'C';
            } else {
                grade = 'D';
            }
            System.out.println("student " + i + " socre is " + score[i] + ", grade is " + grade);
        }
        //关闭资源
        scanner.close();
    }

运行效果

请输入学生人数：
5
请输入 5 个学生成绩 
88
99
66
55
32
最高分是 99
student 0 socre is 88, grade is B
student 1 socre is 99, grade is A
student 2 socre is 66, grade is D
student 3 socre is 55, grade is D
student 4 socre is 32, grade is D

案例2

输出英文星期几

用一个数组，保存星期一到星期天的7个英语单词，从键盘输入1-7，显示对应的单词 {"Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"}

    public static void WeekArrayTest() {
        //1. 声明并初始化星期的数组
        String[] weeks = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};
        //2. 使用Scanner从键盘获取1-7范围的整数
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入[1-7]范围的整数：");
        int number = scanner.nextInt();
        if (number < 1 || number > 7) {
            System.out.println("你输入的输入非法");
        } else {
            //3. 根据输入的整数，到数组中相应的索引位置获取指定的元素（即：星期几）
            System.out.println("对应的星期为：" + weeks[number - 1]);
        }
        scanner.close();
    }

运行效果

请输入[1-7]范围的整数：
5
对应的星期为：Friday