자바 Set, Map

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  HashSet<Integer> abc = new HashSet<Integer>();
  abc.add(1);
  abc.add(2);
  abc.add(3);
  
  Iterator it = abc.iterator();
  Integer temp = 0;
  while(it.hasNext()) {
   temp = (Integer) it.next();
   System.out.println(temp);   
  }
  
  for(Integer item : abc) {
   System.out.println(item);
  }

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  HashMap<String,Integer> abc = new HashMap<String,Integer>();
  abc.put("a", 0);
  abc.put("b", 1);
  abc.put("c", 2);
  
  for(String temp:abc.keySet()) {
   System.out.println(temp);
  }
  
  if(abc.containsKey("a")) {
   System.out.println(abc.get("a"));
  }
  
  abc.clear();
  System.out.println(abc.size());