java 查找list中重复数据实例详解

public static void same(List<String> list) {    String [] indexArr ;    Map<String, String> map = new HashMap<String, String>();    for (int i = 0; i < list.size(); i++) {      String key = list.get(i);      String old = map.get(key);      if (old != null) {        map.put(key, old + "," + (i + 1));      } else {        map.put(key, "" + (i + 1));      }    }    Iterator<String> it = map.keySet().iterator();    int index = -1;    while (it.hasNext()) {      String key = it.next();      String value = map.get(key);      if (value.indexOf(",") != -1) {        System.out.println(key + " 重复,行： " + value);        indexArr = value.split(",");        for (int i = 0; i < indexArr.length; i++) {          index = Integer.parseInt(indexArr[i])-1;          list.set(index, list.get(index)+(1+i));        }      }    }    for (String val : list) {      System.out.println("val = "+val);    }    System.out.println("..................");  }