상속 및 다형성 지정

Question

각 학생의 이름과 ID 번호를 표시하고 합격 또는 불합격 여부를 계산하는 애플리케이션을 작성해야합니다. 나는 4 개의 다른 종류 학생, studenttest, 대학생, 대학원이있을 필요가있다.

학생

class Student { 

//private data members 
private long idNumber = 0; 
private String name = "Not Given"; 
private int markForMaths = 0; 
private int markForEnglish = 0; 
private int markForEconomics = 0; 
private int markForPhilosophy = 0; 
private int markForIT = 0; 


//Default constructor 
public Student() { 
name = "Not Given"; 
idNumber = 0; 
markForMaths = 0; 
markForEnglish = 0; 
markForEconomics = 0; 
markForPhilosophy = 0; 
markForIT = 0; 
} 

//Constructs a new Student with passed name and age parameters. 
public Student(String studentName, long studentIdNumber) { 
name = studentName; 
idNumber = studentIdNumber; 
} 

    //Returns the name of student. 
    public String getName() { 
     return name; 
    } 

    //Returns the idNumber of student. 
    public long getIdNumber() { 
     return idNumber; 
    }  

    //entermarks() 
    //enter all subject marks given as args 
    public void enterMarks(int maths, int english, int economics, int philosophy, int informationTechnology) 
    { 
    markForMaths = maths; 
    markForEnglish = english; 
    markForEconomics = economics; 
    markForPhilosophy = philosophy; 
    markForIT = informationTechnology; 
    } 

    //getMathsMark() 
    //return mark for maths 
    public int getMathsMark() 
    { 
    return markForMaths; 
    } 

    //getEnglishMark() 
    //return mark for English 
    public int getEnglishMark() 
    { 
    return markForEnglish; 
    } 

    //getEconomicsMark() 
    //return mark for Economics 
    public int getEconomicsMark() 
    { 
    return markForEconomics; 
    } 

    //getPhilosophyMark() 
    //return mark for Philosophy 
    public int getPhilosophyMark() 
    { 
    return markForPhilosophy; 
    } 

    //getITMark() 
    //return mark for IT 
    public int getITMark() 
    { 
    return markForIT; 
    } 

    //calculateAverageMark() 
    //return the average of the three marks 
    public double calculateAverageMark() 
    { 
    return ((markForMaths + markForEnglish + 
    markForEconomics + markForPhilosophy + markForIT)/3.0); 
    } 

    //Sets the name of student. 
    public void setName(String studentName) { 
     name = studentName; 
    } 

    //Sets the idNumber of student. 
    public void setIdNumber(long studentIdNumber) { 
     idNumber = studentIdNumber; 
    } 

}//end class 

학부

public class Undergarduate extends Student{ 



} 

대학원을

public class Postgraduate extends Student{ 



} 

StudentTest

을 :

는 지금까지 내가 무엇을 가지고

import java.util.Scanner; 

public class StudentTest { 

static int array; 

//create method createArray 
public static Student[] createArray() { 

    Scanner int_input = new Scanner(System.in); 

    //user enters size of array   
    System.out.print("Enter Size of Array: "); 
    array = int_input.nextInt(); 

    Student[] array = new Student[0]; 

    //read user input as arraySize 
    return new Student[5]; 

}//end method 

//create method populateArray 
public static void populateArray(Student[] array) { 

    Scanner string_input = new Scanner(System.in); 
    Scanner long_input = new Scanner(System.in); 
    Scanner int_input = new Scanner(System.in); 

    for (int i = 0; i < 3; i++) { 
     Student student = new Student(); // new student 

     //set name 
     System.out.println("Enter Student Name: "); 
     student.setName(string_input.nextLine()); 

     //set ID number 
     System.out.println("Enter Student ID Number: "); 
     student.setIdNumber(long_input.nextLong()); 

     //set Marks 
     System.out.println("Enter Marks"); 
     student.enterMarks(int_input.nextInt()); 

     //put new student into array passed to the method 
     array[i] = student; 

    }//end for loop       
}//end method 

//create method display Array 
public static void displayArray(Student[] array){ 
    System.out.println("Array Contents"); 

    for (Student s : array) { 

     System.out.println(String.format("%s %d", s.getName(), 
       s.getIdNumber(), s.getEnglishMark(), s.getMathsMark(), 
       s.getEconomicsMark(), s.getPhilosophyMark(), s.getITMark(), 
       s.calculateAverageMark())); 

    }//end for loop 
}//end method 

public static void main(String [] args) { 
    // create array of size specified by user 
    Student[] students = createArray(); 

    //populate this array with data from user 
    populateArray(students); 

    //display array contents 
    displayArray(students);  

}//end main method 
}//end class 

나는 줄에 studenttest에 오류가 계속

student.enterMarks(int_input.nextInt()); 

오류가 읽

메소드 enterMarks (INT, INT, INT, INT, INT, INT)가에 타입 학생은 인수에 적용 할 수 없습니다. (int)

Answer 1

클래스 학생이 각 과목 (영어, 수학 등)에 대한 점수를 예상 할 때마다 모든 주제를 enterMarks 메소드의 입력으로 전달하도록 StudentTest 클래스를 변경하십시오.

가에서 메서드 호출을 변경

:

student.enterMarks(int_input.nextInt()); 

student.enterMarks(int_input.nextInt(), int_input.nextInt(), int_input.nextInt(), int_input.nextInt(), int_input.nextInt(), int_input.nextInt());//to make it more readable and usable, first take input from keyboard by asking user to enter the number, assign to individual marks variable and then pass it to the method. 

Answer 2

enterMarks(int) 메소드를 호출하려고하지만 학생 클래스에 정의 된 enterMarks(int, int, int, int, int, int) 메소드 만 있습니다.