需求：
查找一个List集合中所有重复的数据，重复的数据可能不止一堆，比如：aa, bb, aa, bb, cc , dd, aa这样的数据。如果有重复数据，则给这些重复数据加上编号，上述数据改为：aa1, bb1, aa2, bb2, cc, dd.
算法如下：
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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("..................");
}
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