列表去重统计重复次数

Map<String,Object> courseMap = new HashMap<>();

for(vo tv: volist){

String key = tv.getCourseId() + "_" + tv.getCalendarId() + "_" + tv.getClassId();
String value = tv.getContent() + "(" + 1 + ")";
boolean flag = courseMap.containsKey(key);
if (flag) {
    int courseNum=1;
    String content = (String) courseMap.get(key);
    String[] split = content.split("\(");
    courseNum = Integer.parseInt(split[1].split("\)")[0]);
    courseNum++;
    value = tv.getContent() + "(" + courseNum + ")";
}
courseMap.put(key, value);

}