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1Z0-804 Questions

Given the code fragment: public class Rank { static CopyOnWriteArraySet arr = new CopyOnWriteArraySet<>(); static void verify() { String var =”"; Iterator e=arr.iterator(); while (e.hasNext()) { var = e.next(); if(var.equals(“A”)) arr.remove(var); } } public static void main (String[] args) { ArrayList list1 = new ArrayList<>(); list1.add(“A”); list1.add(“B”); ArrayList list2 = new ArrayList<>(); list1.add(“A”); list1.add(“D”); arr.addAll(list1); arr.addAll(list2); verify(); for(String var : arr) System.out.print(var + ” “); } } What is the result?

  1. Null B D
  2. Null B null D
  3. B D
  4. D
  5. An exception is thrown at runtime

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