Question

这是我到目前为止所做的事情。我不确定如何从这里继续。这样的问题是否应该使用double for循环？

public class testing {

    public static void main(String[] args) throws IOException{
        Scanner sc = new Scanner(System.in);
        System.out.println("How many people?");
        String input = sc.nextLine();
        int z = Integer.parseInt(input);
        for(int i =0; i <=z; i++) {
            System.out.println("Name,Language,English,Math?");
            String input2 = sc.nextLine();
            String[] myArr = new String[] {input2};

            for(int j = 0; j<4; j++) {
                String [] myArr1 = myArr[j].split(",");
                System.out.println(myArr1[0]);
            }
            //System.out.println(myArr[0]);
            //student student1 = new student(myArr[i]);
            for(int j = 0; j< 4; j++) {
                String[] studentpl = myArr[i].split(",");
            }
            //ArrayList<student> aList = new ArrayList<student>();
            //aList.add(input2);
            //student1 student new student1();
            //student stu = new student(input);
        }
    }
}

Answer 1

首先，您需要列出所有学生的名单。同样，设置一个包含学生属性（姓名，语言，英语，数学）的学生班可能很有用。在获得要处理的学生人数的输入后，您可以循环获取学生数据。从输入中获取学生数据后，请创建一个Student类的实例，并将所有获取的数据设置为该类。设置完所有数据后，您可以将学生添加到学生列表中。我在下面提供了一个示例代码，但是此代码在输入中没有错误检查。例如，您可以检查numberOfStudents的输入是否有效。可以改进此代码，但为简单起见，我忽略了这些检查。

这是主要班级

public class Testing {
    public static void main(String[] args) throws IOException{
        Scanner sc = new Scanner(System.in);
        System.out.println("How many people?");
        int numberOfStudents = sc.nextInt();
        ArrayList<Student> studentList = new ArrayList<Student>();

        for(int i = 0; i < numberOfStudents; i++) {
            System.out.println("Name,Language,English,Math?");
            String dataInput = sc.nextLine();
            String[] dataInput = dataInput.split(",");
            // You can add here checking if the dataInput is valid. Example if it really contains all the needed input by checking the size of dataInput

            Student student = new Student();
            student.setName(dataInput[0]);
            student.setLanguage(dataInput[1]);
            student.setEnglish(dataInput[2]);
            student.setMath(dataInput[3]);
            studentList.add(student);
        }
    }
}

这是学生班。您应该将此类导入到主类。

public class Student {
     private name;
     private language;
     private english;
     private math;

     // insert here getter and setter methods for each attribute
}

Answer 2

这应该使您入门：

import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Main {

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

        Scanner sc = new Scanner(System.in);
        System.out.println("How many people?");
        int input = sc.nextInt(); sc.nextLine();
        ArrayList<Student> students = new ArrayList<Student>();

        for (int i = 0; i < input; i++) {
            System.out.println("Name, Language, English, Math?");

            String input2 = sc.nextLine();
            String[] myArr = input2.split("[, ]+");

            students.add(new Student(myArr[0], tryParse(myArr[1]), tryParse(myArr[2]), tryParse(myArr[3])));

        }

        for(Student s : students)
            System.out.println(s.name);

    }

    public static double tryParse(String grade) {
        return Double.parseDouble(grade);
    }

}

class Student{

    public String name;
    public double language;
    public double english;
    public double math;

    public Student(String name, double language, double english, double math) {
        this.name = name;
        this.language = language;
        this.english = english;
        this.math = math;
    }

}

尽量不要以小写字母开头类名。这是不好的做法。

存储名称，语言标记，英语标记和数学标记。获得三个分数的平均值。我不确定如何继续

2 个答案: