Question

i got an error when i run this code!

   private class ValuesClass {

            List<Float> value;

            public void addv(String _value) {
                    Float f = new Float(_value);
                    this.value.add(f);
            }
    }

This is the error returned

0.83
0.83
Exception in thread "main" java.lang.NullPointerException
    at com.gsware.gsmarketanalyzer.StockQuote$ValuesClass.addv(StockQuote.java:216)

I don’t know where is the error!

Answer 1

You have to instantiate the list, otherwise value is null:

List<Float> value = new ArrayList<Float>;