Java - arrayList of Integer not initialize
===

I don't know how to initialize synapseNeuronList arrayList. got null error 


    private ArrayList <Integer> synapseNeuronList;
    for (int j=1;j<strLine.split(" ").length-1;j++){							                  
    synapseNeuronList.add(Integer.valueOf(strLine.split(" ")[j]));  
    }

