[Solved] how to add string array elements to arraylist in java

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Your budgetEntityList is empty when you do budgetEntity= budgetEntityList.get(k);

Doing a new ArrayList<>(capacity) does not fill your ArrayList with BudgetList objects, it only sets the initial capacity of your ArrayList.

So, what you need to do is:

 for(int k=0;   k < budgetEntityList.size() ;   k++) {
      budgetEntity = new BudgetEntity();
      budgetEntityList.add(budgetEntity);
  }

And then, set the total of your BudgetEntity

solved how to add string array elements to arraylist in java