hashset(2种遍历方式)

		//hashset(2种遍历方式)
		Set<String> test = new HashSet<String>();
		test.add("1");
		test.add("2");
		test.add("1");
		test.add("2");
		System.out.println(test.size());
		Iterator<String> iter = test.iterator();
		while(iter.hasNext()){
			System.out.println(iter.next().toString());
		}
		for(String ss:test){
			System.out.println(ss);
		}