不能在每個數組索引來初始化對象

Question

我試圖創建一個數組，可以讓一部電影

public void addMovie() { 
    for(int x = 0; x < mlist.length; x++) { 
    mlist[x] = new Movies(); 
    System.out.println("What is the title of the movie? "); 
    title = scan.nextLine(); 
    System.out.println("What is the genre of the movie? "); 
    genre = scan.nextLine(); 
    System.out.println("Who is the director of the movie? "); 
    director = scan.nextLine(); 
    System.out.println("What is the cost of the movie? "); 
    cost = scan.nextInt(); 
    } 
} 

當我編譯用戶輸入的信息，它說，

mlist[x] = new Movies(); 

構造函數類Movies中的電影不能應用於給定的類型;

完整代碼：

import java.util.Scanner; 

public class Movies 
{ 
    private String title, genre, director; 
    private int cost; 
    Movies mlist[] = new Movies[5]; 

    Scanner scan = new Scanner(System.in); 

    public Movies(String mtitle, String mgenre, String mdirector, int mcost) 
    { 
     title = mtitle; 
     genre = mgenre; 
     director = mdirector; 
     cost = mcost; 
    } 

    public void addMovie() 
    { 
     for(int x = 0; x < mlist.length; x++) 
     { 
     mlist[x] = new Movies(); 
     System.out.println("What is the title of the movie? "); 
     title = scan.nextLine(); 
     System.out.println("What is the genre of the movie? "); 
     genre = scan.nextLine(); 
     System.out.println("Who is the director of the movie? "); 
     director = scan.nextLine(); 
     System.out.println("What is the cost of the movie? "); 
     cost = scan.nextInt(); 
     } 
    } 


    public String getTitle() 
    { 
     return title; 
    } 
    public String getGenre() 
    { 
     return genre; 
    } 
    public String getDirector() 
    { 
     return director; 
    } 
    public int getCost() 
    { 
     return cost; 
    } 
} 

Answer 1

在功能addMovie（），您是從用戶採取投入和任何地方使用它沒有使用。與其調用無參數構造函數，不如調用您創建的參數化構造函數，並將輸入值傳遞給此構造函數。

代碼：

public void addMovie() { 
    for (int x = 0; x < mlist.length; x++) { 
     // Deleted the call to default constructor. 
     System.out.println("What is the title of the movie? "); 
     title = scan.nextLine(); 
     System.out.println("What is the genre of the movie? "); 
     genre = scan.nextLine(); 
     System.out.println("Who is the director of the movie? "); 
     director = scan.nextLine(); 
     System.out.println("What is the cost of the movie? "); 
     cost = scan.nextInt(); 
     // Added this code 
     mlist[x] = new Movies(title,genre,director,cost); 
    } 
} 

這應該解決的錯誤。