java - Save data into ArrayList of other class -

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i have class define array list , getter method array list:

private arraylist<double> abc = new arraylist<double>();  public void setabc(arraylist<double> abc) {     this.abc = abc; }

in class try save data array list method: 

private void test() {      abcclass x = new abcclass();      arraylist<abcclass> list = new arraylist<abcclass>();     arraylist.add(3.14);     arraylist.add(5.22);      x.setabc(list); }

whenever try this, prompted with:

exception in thread "javafx application thread" java.lang.runtimeexception: java.lang.reflect.invocationtargetexception .... caused by: java.lang.nullpointerexception

arraylist.add(3.14); should list.add(3.14) name gave variable initialized in line before (i.e. arraylist<abcclass> list = new arraylist<abcclass>();)


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