Question

JAVA / please add comments

Write code for a method named loadDatagrams() that returns an array of type Datagram. The method will read from the filepath C:/folder/grams.dgf and the file contains an array of type Datagram ( you may assume that the class definition is visible to the method) Remember to include appropriate exception handling

Answer 1

public Datagram[] loadDatagrams() {
       //Opening the file
       File f = new File("C:/folder/grams.dgf");
      
       //Creating an arraylist of datagram objects
       List<Datagram> li = new ArrayList<Datagram>();
      
       //This statement creates a scanner and closes it automatically
       try(Scanner s = new Scanner(new FileReader(f));) {
          
          
           while(s.hasNext())
           {
               //Suppose every line of the file contains two attributes of datagram class(header and payload) separated by space in the file
               String[] temp = s.nextLine().split(" ");
              
               //Creating a datagram object and adding it to list
               li.add(new Datagram(temp[0],temp[1]));
           }
       } catch (FileNotFoundException e) {
          
           e.printStackTrace();
       }
      
       //Converting the list to an Datagram array
       return li.toArray(new Datagram[li.size()]);
   }

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