java 查找list中重复数据实例详解

publicstaticvoidsame(Listlist) {

    String [] indexArr ;

    Mapmap =newHashMap();

    for(inti =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));

      }

    }

    Iteratorit = map.keySet().iterator();

    intindex = -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(inti =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("..................");

  }