for (Iterator iterator = testSet.iterator(); iterator.hasNext();) { iterator.next(); count++; } System.out.println("iterator:" + (System.currentTimeMillis()-start) + " count:" +count); start = System.currentTimeMillis(); List<String> testList = new ArrayList<String>(testSet); count = 0; for (String string : testList) { count++; } if (s1.indexOf(s4) != -1) { // 部分一致