java之IO流编程题 存储多个学生成绩信息到本地

题目:

请编写程序，完成键盘录入学生信息，并计算总分将学生信息与总分一同写入文本文件.

要求键盘录入3个学生信息(姓名,语文成绩,数学成绩) 求出每个学生的总分 ,并且将学生的信息写入Student.txt文件中.

文件中的效果下所示:

姓名 语文成绩 数学成绩 总分

李四 99 88 177

张三 20 90 112

王五 100 100 200

---

答案:

自定义一个异常类来处理用户输入成绩不合规的情况.加强程序健壮性.

//类名要见名知意,长一点没关系
public class IllegalScoreException extends  RuntimeException{
    public IllegalScoreException() {
    }

    public IllegalScoreException(String message) {
        super(message);
    }
}

创建Student学生类封装学生信息

@Data
public class Student {
  private String name;
  private int  chineseScore;
  private int mathScore;
  private int totalScore;



    public Student(String name, int chineseScore, int mathScore) {
        if (chineseScore>100 || chineseScore<0) throw new IllegalScoreException("分数不合法");
        if (mathScore>100 || mathScore<0) throw new IllegalScoreException("分数不合法");
        this.name = name;
        this.chineseScore = chineseScore;
        this.mathScore = mathScore;
        this.totalScore = chineseScore+mathScore;
    }
}

实现题目要求

public static void main(String[] args) throws Exception {

​    Scanner scanner = new Scanner(System.*in*);
​    System.*out*.println("请录入学生信息:");
​    System.*out*.println("录入格式 : 姓名  语文成绩   数学成绩");

​    try (FileOutputStream os = new FileOutputStream("Student.txt");
​         BufferedOutputStream bos = new BufferedOutputStream(os);) {
​        bos.write("姓名\t语文成绩\t数学成绩\t总成绩\r".getBytes());
​        bos.flush();
​        //已知循环次数,用for循环
​        for (int i = 0; i < 3; i++) {
​            System.*out*.println("请输入第" + (i + 1) + "个学生信息:");
​            String s = scanner.nextLine();
​            String[] split = s.split("\\ +");
​            Student student = new Student(split[0], Integer.*parseInt*(split[1]), Integer.*parseInt*(split[2]));
​            bos.write((student.getName() + "\t" + student.getChineseScore() + "\t\t" + student.getMathScore() + "\t\t" + student.getTotalScore() + "\r").getBytes());
​            bos.flush();
​        }
​    }catch(IllegalScoreException|NumberFormatException|ArrayIndexOutOfBoundsException  e){
​        System.*out*.println("分数不合法,请确认后输入");
​    }
​    catch (Exception e) {
​        e.printStackTrace();
​        System.*out*.println("录入失败,请重试");
​    }

这里的四个异常的作用要能够理解明白.

结果显示: