Question

/**
* Loads a list of items from the given file. Each line is in the format
* <item type>~<item data>. The createFromString() methods in the item
* classes will be used to parse the item data.
* @param filename the filename
* @return the list of items
* @throws IOException if the file can't be opened
*/
public static List<Item> loadItems(String filename) throws IOException {
List<Item> items = new ArrayList<>();
Scanner inPut = new Scanner(new FileReader(filename));
       while(inPut.hasNextLine()) {
           String line = inPut.nextLine();
           String [] tokens = line.split(":");
           String type = tokens[0];
           String data = tokens[1];
           items.add(type,data);
       }
return items;
}
}

can you please check this line " items.add(type,data);" . I am having problem with it

Answer 1

Note:

1.)We can't write List generic type as class name.

2.)We can't add two arguments ex:add(data,type)

we can add only one item by uisng add() Method, ex:add(data). If you want add multiple items then you can use addAll() method

Code:

package assignment;

import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Item {
   public static List<String> loadItems(String filename) throws IOException {
       List<String> items = new ArrayList<>();
       Scanner inPut = new Scanner(new FileReader(filename));
       while(inPut.hasNextLine()) {
       String line = inPut.nextLine();
       String [] tokens = line.split(":");
       String type = tokens[0];
       String data = tokens[1];
       items.add(type);
       items.add(data);
       }     
       return items;
       }

   public static void main(String[] args) throws IOException {
       List list=loadItems("abc.file");
       list.forEach(System.out::println);

   }

}

Note:****I hope your happy with my answer***If you have any doubts please comment me****Thank you.....