HashMap ( getOrDefault)

Map<key, value>

HashMap<key, value>

 

getOrDefault

 

ex)

 

String[] participant = {"King" , "Queen", "White"};

Map<String, Integer> map = new HashMap<String, Integer>();

map.put(String a: participant) {

map.put(a, map.getOrDefault(a, 0) +1);

};

System.out.println(map);