java - Count occurrences of words in ArrayList -

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this question has answer here:

i have arraylist of words duplicate entries.

i want count , save occurrences each word in data structure.

how can it?

if haven't big strings list shortest way implement using collections.frequency method:

list<string> list = new arraylist<string>(); list.add("aaa"); list.add("bbb"); list.add("aaa");  set<string> unique = new hashset<string>(list); (string key : unique) {     system.out.println(key + ": " + collections.frequency(list, key)); }

output:

aaa: 2 bbb: 1

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