関連ワード:  how to count arraylist in java    how to count elements in arraylist in java    how to count duplicate elements in arraylist in java 8    how to get count of arraylist in java    how to calculate length of arraylist in java    how to calculate size of arraylist in java    how to count number of elements in arraylist java    how to calculate average of an arraylist in java    how to get count of duplicate elements in arraylist in java