如何改變陣列

Question

所以我現在用的是GSON Libary輸出我的用戶輸入陣列到以.json文件，我在想，所以它輸出信息來源沒有註釋，使其在某種程度上我怎麼代碼時輸出更容易將.json文件導入到數組中？

我將展示的代碼，以及如何陣列輸出，因此更有意義。

Postit.java

package postit; 

import java.util.Scanner; 

class Postit { 
public static Scanner menu = new Scanner(System.in); 
public static void main(String[] args) throws Exception { 

    int MenuOption = 0; 

    NewStorage G = new NewStorage(); // Case 1 Object 



    while(MenuOption != 3){ 



     System.out.println(

       "\n--------Note System-------\n" + 
         "----------------------------\n" + 
         "1. Create a Note \n" + 
         "2. View Notes \n" + 
         "3. Close Program\n" + 
         "4. Write File\n" + 
         "5. Test code\n" + 
         "----------------------------\n"); 

     MenuOption = menu.nextInt(); 
     menu.nextLine(); 

     switch (MenuOption) { 

      case 1: 


       G.printinfo(); 
       G.Notestore(); 

       break; 

      case 2: 

       G.viewNotes(); 
       G.printNotes(); 
       break; 

      case 3: 

       System.out.println("Program is closing"); 
       System.exit(0); 


       break; 

      case 4: 


       G.writeFile(); 


       System.out.println("Done."); 
       break; 

      case 5: 

       G.Gsontest(); 
       break; 

      default: 

       System.out.println("Invalid choice."); 

       break; 
     } 
    } 
} 
} 

NewStorage.java

package postit; 

import java.util.Scanner; 
import java.util.ArrayList; 


import java.io.FileWriter; 
import java.io.IOException; 
import java.io.Writer; 
import com.google.gson.Gson; 
import com.google.gson.GsonBuilder; 

class NewStorage { 
Gson gson = new Gson(); 


ArrayList<Note> NoteArray = new ArrayList<Note>(20); 

public void printinfo() { 
    System.out.println("--- Fill note here ---"); 
} 



public void Gsontest() { 
    String userJson = gson.toJson(NoteArray.toString()); 
    gson.toJson(userJson, System.out); 
    } 

public void Notestore() { 
    System.out.println("Enter the note ID you wish to attach the note with\n\n"); 
    String inputIDnote = Postit.menu.nextLine(); 
    System.out.println("Enter your note\n\n"); 
    String noteDescription = Postit.menu.nextLine(); 
    NoteArray.add(new Note(inputIDnote, noteDescription)); 
} 

public void viewNotes() { 
    System.out.println("Please enter the number of the note you wish to view."); 
    int count = 0; 

    for (int i = 0; i < NoteArray.size(); i++) { 
     System.out.println((count++) + ": " + NoteArray.get(i).inputIDnote); 
    } 
} 

public void printNotes() { 

    int count = Postit.menu.nextInt(); 
    Postit.menu.nextLine(); 

    System.out.println(count + " " + NoteArray.get(count)); 
} 

public void writeFile() throws IOException { 

    try 
     (Writer writer = new FileWriter("src\\Output.json")) 
     { 
      Gson gson = new GsonBuilder().create(); 
      for (int i = 0; i < NoteArray.size(); i++) { 
       gson.toJson(NoteArray.get(i).toString(), writer); 
      } 
      writer.close(); 
     } 
    } 
} 

note.java

package postit; 

class Note { 



String inputIDnote; 
String noteDescription; 
    public Note(String inputIDnote, String noteDescription) { 
    this.inputIDnote = inputIDnote; 
    this.noteDescription = noteDescription; 
} 
@Override 
public String toString() { 
    return "\n\n" + "ID: " + inputIDnote + "\n\n" + " Description: " + 
noteDescription; 
} 

} 

的上傳.json文件被輸出這樣

「\ n \ nID：ID1 \ n \ n描述：NOTE1「 「\ n \的NID：ID2 \ n \ n說明：注2：」

用下面的值添加

ID = ID1描述= NOTE1 ID = ID2描述 - 注2：

Answer 1

要使用GSON序列化你的陣列做到這一點。

public void writeFile() throws IOException { 
    try (Writer writer = new FileWriter("src\\Output.json")) { 
      Gson gson = new Gson(); 
      gson.toJson(NoteArray, writer); 
     } 
    } 
}