Putting a string into ArrayList<String>

[k4ff1n34dd1c7]

I am trying to read a file and pick out certain pieces of information. When a piece of information come out i need to add it into an arraylist.

public void readImports(Scanner sc){
        while(sc.hasNextLine()){
      
            String[] importLineSplit = sc.nextLine().split("\\s+");
            
            for(int i = 1; i < importLineSplit.length; i ++){
                    if(importLineSplit[i].contains(";")) break;
                            if(importLineSplit[i].contains(",")){
                                importLineSplit[i] = importLineSplit[i].substring(0,(importLineSplit[i].length()-1));                                                      
                            }
                            System.out.println(importLineSplit[i]);
                            MibImport.addMibImport(importLineSplit[i]);
                            
                }
            }
        }

This is the method that reads after the word "IMPORT" is found until it reaches a semicolon. Everything works perfectly fine until i reach the line MibImport.addMibImport(importLineSplit[i]); then i get a null pointer exception. MibImport is its own class for all my import data and contains the method

 public void addMibImport(Object data){
        importsList.add(data);
    }

this is so i can add each string individually at the end of the arraylist. So how can i add each element to the arraylist without a nullpointer?

[Eranga]

Did you get the exception each time or at the last insertion?

Since both methods are in the same class what's the point of using the class reference to access a method.

[pbrockway2]

Something's weird here:

MibImport.addMibImport(importLineSplit[i]);

This line calls a class (static) method, but the following declares an instance (nonstatic) method.

public void addMibImport(Object data){

Actual code would help and the actual and complete compiler message(s) that the code gives rise to.

[k4ff1n34dd1c7]

The compiler gives me null pointer exception then the stack starting at my import line. Its actually at the first insertion. Thats whats throwing me off. I run through the debugger and none of the insertions are null! They are all strings. I am aware that the class is static. I want to put the imports in a different class because i need to add more methods to manipulate the array list. basically the imports text is an object.

MibImport.addMibImport(importLineSplit[i]);

Is my error because when a constant or literal string in that method i get the same error. When i get in work tomorrow i will post the complete code listings.

[mtyoung]

importsList is static or not
importsList assigned to an ArrayList or not?

[k4ff1n34dd1c7]

importsList is not static and it is assigned to an arrayList.
But i realized my error i over simplfyed my approach. So i am going to create an ArrayList in my reading class and just extract the data from there. Thanks for all the help. I was trying to create a class using a static methods. rookie mistake.