Question

该计划将计算学生的最终成绩。每个学生都持有他/她的中期成绩，第二季成绩和期末考试的记录。最终成绩将是中期成绩的25％，第二季成绩的30％和期末考试的45％。该计划将询问10名学生的数据。每个学生的数据包括姓名，部分，期中成绩，第二季度和期末考试。

我如何以表格形式显示学生的成绩？

这是gradesummary.java的代码

public class gradesummary {
public static void main(String args[]){
    Scanner cin = new Scanner(System.in);
    Vector<Student> list = new Vector<>();

    for(int x=0; x<10 ;x++){
        Student s = new Student();
        System.out.print("Name: ");
        s.name = cin.nextLine();
        System.out.print("Section: ");
        s.section = cin.nextLine();
        System.out.print("Midterm Grade: ");
        s.midgrade = cin.nextDouble();
        System.out.print("Second Quarter: ");
        s.secondqtr = cin.nextDouble();
        System.out.print("Final Exam: ");
        s.finexam = cin.nextDouble();

        //save s in data collection
        list.add(s);

    }

    for(int x = 0; x<10; x++){
    //what will i do here next?
        Student xtt = list.get(x);
    }
}
}

这是Student.java的代码

public class Student {
//is this class correct?
String name;
String section;
Double midgrade;
Double secondqtr;
Double finexam;
Double fingrade;

public Student(){

}

public Student (String n, String s, Double mg, Double sq, Double fe, Double fg){
    name = n;
    section = s;
    midgrade = mg;
    secondqtr = sq;
    finexam = fe;
    fingrade = fg;      
}   

}

我想要这样的输出

Name        Midterm Grade    Second Quarter    Final Exam    Final Grade
Student2        80               79.69            85           87.674
Student2        78               77.69            81           79.257
Student3        88               87               89           88.15
Student4        88.67            84               86.78        86.4185   
Student5        98               90               94           93.8
Student6        93               91               90           91.05
Student7        84               78               87           83.55
Student8        82               86.4             89           86.47
Student9        72               79               81           78.15
Student10       85.34            81               83           82.985

Answer 1

我建议您将数据直接读入学生的字段。为此，您只能将Scanner对象传递给Student构造函数。

你只需要：

public Student (Scanner sc){
    name = sc.next();
    section = sc.next()
    .
    .
    . 
}

确保在阅读学生记录后关闭扫描仪。

您还应该查看printf（example）来打印表格。

Answer 2

你应该这样写：

for(Student student: list){

    System.out.printf("%-8s   %-8s   %-8s  %-8s%n", "Name", "Midterm Grade", "Second Quarter", "Final Exam");

    System.out.printf("%1d  -8s   %7.1f   %7.1f   %7.1f%n", student.get...);
}

最终成绩数学是：

float finalGrade =（student.get（FinalExam）* 45/100）+ （student.get（MidtermGrade）* 20/100 ......）

Answer 3

您会注意到一些变化，但我对此的看法是：

public class GradeSummary {
    public static void main(String args[]) {
        Scanner cin = new Scanner(System.in);
        List<Student> list = new ArrayList<>();

        for (int x = 0; x < 10; x++) {
            Student s = new Student();
            System.out.print("Name: ");
            s.setName(cin.nextLine());
            System.out.print("Section: ");
            s.setSection(cin.nextLine());
            System.out.print("Midterm Grade: ");
            s.setMidterm(cin.nextDouble());
            System.out.print("Second Quarter: ");
            s.setSecondQuarter(cin.nextDouble());
            System.out.print("Final Exam: ");
            s.setFinalExam(cin.nextDouble());
            list.add(s);
        }

        for (Student student : list) {
            System.out.println(String.format("Name: %s, Final Grade: %s", student.getName(), student.getWeightedGrade()));
        }
    }
}

和

public class Student {
    private String name;
    private String section;
    private Double midterm;
    private Double secondQuarter;
    private Double finalExam;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSection() {
        return section;
    }

    public void setSection(String section) {
        this.section = section;
    }

    public Double getMidterm() {
        return midterm;
    }

    public void setMidterm(Double midterm) {
        this.midterm = midterm;
    }

    public Double getSecondQuarter() {
        return secondQuarter;
    }

    public void setSecondQuarter(Double secondQuarter) {
        this.secondQuarter = secondQuarter;
    }

    public Double getFinalExam() {
        return finalExam;
    }

    public void setFinalExam(Double finalExam) {
        this.finalExam = finalExam;
    }

    public Double getWeightedGrade()
    {
        return this.midterm * .25 + this.secondQuarter * .30 + this.finalExam * .45;
    }
}

如何在这个程序上执行算法

3 个答案: