Map & ltString, Integer & gt map = new hashmap & lt string, integer & gt (); //map stores each integer and its occurrence times.
for(int temp : arr){
If (! map.containsKey(temp+" "))
map.put(temp+" "， 1)；
Otherwise {
;
map . put("+temp，map . get(temp+" ")+ 1)； //Number of occurrences plus 1
}
if(map.get(temp+"")==3)
system . out . println(temp)；
}
}