Question

我正在尝试做什么：

输入1到5之间的数字

退出计划
向4学生数组添加详细信息（ID，姓名，assignment_mark1，assignment_mark2，考试）
输出学生的详细信息
计算并输出学生的平均整体分数（assignment_mark1，assignment_mark2，examination）/ 3
输入学生ID并显示输入学生详细信息

我不能使用数组列表

我的对象类：

 public class Student{
 Scanner keyboard = new Scanner(System.in);
 private String name;
 private int ID;
 private float assignment_mark1;
 private float assignment_mark2;
 private float examination;

 StudentDetail(){ //default constructor
 this.name= "default";
 this.ID =0;
 this.assignment_mark1 = 0;
 this.assignment_mark2 = 0;
 this.examination = 0;
 }

 Student(String name, int ID, float assignment_mark1, float 
assignment_mark2, 
 float examination){   
 this.name = name;
 this.ID= ID;
 this.assignment_mark1= assignment_mark1;
 this.assignment_mark2 = assignment_mark2;
 this.examination = examination;

 }

  /*
 get and set methods here
  */

 quit(){ //quit program }

 addDetailsToAllStudent();  

 outputAllDetails();

 computeAverageMarks(double assignment1, double assignment2, double 
examination, double practical_work) {  
 double total=0;
total = (assignment1 + assignment2 + examination) / 3.0;
return  total;

 displayStudentDetail();

静态类：

public static void main(String[] args) {
  Scanner keyboard = new Scanner(System.in);


  Student[] array = new Student[4];//
  boolean isRunning = true;
  int choice = 0;
  while(isRunning){

      System.out.println("1. Quit ");
      System.out.println("2. Add  Details to all students ");
      System.out.println("3. Output all student details");
      System.out.println("4. compute average student marks");
      System.out.println("5. Display student details based on ID");
      choice = keyboard.nextInt();

   while(choice>0 && choice<=5)
   {
      if (choice == 1)  //quit
      {
         System.exit(0);
      }
      else if (choice == 2) //Add  Details to all students
      { 

          for(int i=0; i< array.length ; i++)
         {
          array[i] = new StudentDetail();

          System.out.println("enter student"+(i +1) +":");

           System.out.println("name");
          String first_name = keyboard.nextLine();
          array[i].setName(name);


           System.out.println("Student id");
          int ID= keyboard.nextInt();
          array[i].setStudent_id(ID);


           System.out.println("get Assignment1");
          int getAssignment1 = keyboard.nextInt();
          array[i].setAssignment1(getAssignment1);

           System.out.println("get Assignment2 ");
          int getAssignment2 = keyboard.nextInt();
          array[i].setAssignment2(getAssignment2);

       System.out.println("get Examination");
          int getExamination = keyboard.nextInt();
          array[i].setExamination(getExamination);
    }
   }

     else if (choice == 3) //Output all student details
       {
           for(int i=0; i< array.length ; i++)
          {
              System.out.println(array[i].getName());
              System.out.println(array[i].getStudent_id());
              System.out.println(array[i].getAssignment1());
              System.out.println(array[i].getAssignment2());
              System.out.println(array[i].getExamination());
          }
      }

      else if (choice == 4) //compute average student marks
      {
         for(int i=0; i< array.length ; i++)
         {
         double temp = array[i].getAssignment1();
         double temp2=  array[i].getAssignment2();
         double temp3= array[i].getPractical_work();
         double temp4 =  array[i].getExamination();


         System.out.println(array[i].averageOverallMark(temp, 
           temp2,temp3,temp4));
         }
      }
      else if (choice == 5) // Display student details based on ID
      {
          numberOfStudentAchieveMark();
      }

我的问题：

通常在创建对象时我会做这样的事情：“Student std1 = new Student（）;” 然后，如果我想运行方法quit（），它将是std1.quit（）; 但是，因为我正在创建一个数组，我将如何运行方法quit（）或任何其他方法;

-------------已解决-------------------

Answer 1

对于你的问题1：你可以像上面一样排列[i] .getName（）。对于你的问题2：因为你使用私人浮动来获得任务分数。你需要完成你的getter和setter。对于您的问题3：在步骤2中创建设置后，您可以在静态类中创建的Student对象上调用该setter。

创建学生数组，并使用值

我的对象类：

静态类：

1 个答案: