Как я могу отобразить массив объектов?

Question

Как я могу рассчитать массив объектов метода readAllExams (Scanner s) ?? Выход должен быть чем-л так:

John Morgan 27 'M' 100

Марка Шермана 55 'F' 98

................ ......

Но вместо этого я получаю только номера индексов.

class Exam { 

    private String firstName; 
    private String lastName; 
    private int ID; 
    private char examType; 
    private int score; 


    public Exam(String firstName, String lastName, int ID, char examType, int score) 
    { 
     this.firstName = firstName; 
     this.lastName = lastName; 
     this.ID = ID; 
     this.examType = examType; 
     this.score = score; 
    } 

    public String getFirstName() 
    { 
     return this.firstName; 
    } 

    public String getLastName() 
    { 
     return this.lastName; 
    } 

    public int getID() 
    { 
     return this.ID; 
    } 

    public char getExamType() 
    { 
     return this.examType; 
    } 

    public int getScore() 
    { 
     return this.score; 
    } 

    public String toString() 
    { 
     return this.firstName + " " + this.lastName + " " + this.ID + " " + this.examType + " " + this.score; 
    } 

    public boolean equals(Exam object) 
    { 
     if(this.equals(object)) 
      return true; 

     return false; 
    } 

} 


import java.io.*; 
import java.util.*; 

class P2 { 

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

     Scanner data = new Scanner(new File("Exam.txt")); 
     Exam[] readObjects = readAllExams(data); 
     //Exam[] collateObjects = collateExams(readObjects); 

     for(int i = 0; i < readObjects.length; i++) 
     { 
      System.out.println(i); 
     } 


    } 

    public static Exam[] readAllExams(Scanner s) throws ArrayIndexOutOfBoundsException 
    { 

     String firstName = ""; 
     String lastName = ""; 
     int ID = 0; 
     String examType = ""; 
     char examTypeCasted; 
     int score = 0; 

     int index = 0; 

     Exam[] object = new Exam[50]; 

     while(s.hasNext()) 
     { 
      //Returns firtsName and lastName 
      firstName = s.next(); 
      lastName = s.next(); 

      //Returns ID number 
      if(s.hasNextInt()) 
      { 
       ID = s.nextInt(); 
      } 
      else 
       s.next(); 

      //Returns examType which is 'M' or 'F' 
      examType = s.next(); 
      examTypeCasted = examType.charAt(0); 

      if(s.hasNextInt()) 
      { 
       score = s.nextInt(); 
      } 

      object[index] = new Exam(firstName, lastName, ID, examTypeCasted, score); 
      //System.out.println(); 
      index++; 
     } 
     readExam(s); 
     return object; 


    } 

    public static Exam readExam(Scanner s) 
    { 
     String firstName = ""; 
     String lastName = ""; 
     int ID = 0; 
     String examType = ""; 
     char examTypeCasted = 0; 
     int score = 0; 

     while (s.hasNext()) 
     { 
      //Returns firtsName and lastName 
      firstName = s.next(); 
      lastName = s.next(); 

      //Returns ID number 
      if(s.hasNextInt()) 
      { 
       ID = s.nextInt(); 
      } 
      //Returns examType which is 'M' or 'F' 
      examType = s.next(); 
      examTypeCasted = examType.charAt(0); 

      if(s.hasNextInt()) 
      { 
       score = s.nextInt(); 
      } 

     } 
     Exam temp = new Exam(firstName, lastName, ID, examTypeCasted, score); 
     return temp; 
    } 

Answer 1

Вы можете использовать класс Arrays Utility (например), чтобы отобразить содержимое целого массива, но ваш Exam класс должен переписать toString().

Пример:

Exams[] exams = ... 
System.out.println(Arrays.toString(exams)); 

Answer 2

Изменение:

System.out.println(i); 

в

System.out.println(readObjects[i]);