public static void main(String[] args) {
List<Integer> ids = new ArrayList<>();
for(int i = 1;i<10;i++){
ids.add(i);
ids.add(i+1);
ids.add(i+2);
}
for(Integer id : ids){
System.out.println("---------"+ id + "---------");
}
List<Map<String, Object>> list = new ArrayList<>();
Set<Integer> set = new HashSet<>(ids);
for(Integer id : set){
Map<String,Object> map = new HashMap<>();
map.put("id", id);
map.put("count", Collections.frequency(ids, id));
list.add(map);
}
System.out.println(list.toString());
}
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