java - 如何用java读取扫描仪中的输入

Question

我想显示 GPA 较高的学生的姓名。我想知道如何限制扫描仪中的输入，就像我只想有 2 个学生一样，所以我要计算他们的差距并返回分数最高的那个，请帮忙。

我使用了如下所示的方法扫描仪

public double computerGPA() {

    double score;

    Scanner sc = new Scanner(System.in);
    System.out.println("enter the sutdent quiz score:");
    double score1 = sc.nextDouble();
    System.out.println("enter the student test score:");
    double score2 = sc.nextDouble();
    System.out.println("enter the student assigments score");
    double score3 = sc.nextDouble();
    sc.close();
    score = 0.2 * score1 + 0.5 * score2 + 0.3 * score3;

    return score;
   }
}

if((student1.computerGPA())<(student2.computerGPA())) {
    System.out.println("the student "+student2.name+"has higher GPA"); 
} 
if((student2.computerGPA())<(student1.computerGPA())) {
    System.out.println("the student "+student1.name+"has higher GPA"); 
} 
if((student1.computerGPA())==(student2.computerGPA())) { 
    System.out.println("the two students had the same GPA"); 
}

Answer 1

如果我没看错的话，你会想要在你的学生类(class)中有一个私有(private)双倍，而不是将分数值返回给程序，你可以使用一个 void 方法，将学生的私有(private)双倍设置为该分数

    private double studentScore;

        public static void computerGPA() {



    Scanner sc= new Scanner(System.in);
    System.out.println("enter the sutdent quiz score:");
    double score1=sc.nextDouble();
    System.out.println("enter the student test score:");
    System.out.println("enter the student assigments score");
    double score3=sc.nextDouble();
    sc.close();

    studentScore =0.2*score1+0.5*score2+0.3*score3;

然后你可以为你的两个学生对象提供一个 get 方法并以这种方式进行比较

  if (student1.getGPAScore() > student2.getGPAScore()) {
  System.out.println("Student 1 has a higher score");
  } else {
   System.out.println("Student 2 has a higher score");
  }

希望这是有道理的