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javahashmap

Fast way to load all alphabetic characters to a hashmap

For example I have this Hashmap: 

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

Instead of doing map.put("A",0), map.put("B",0)... until map.put("C",0), is there any way we can make it fast?

Solution

  • Do it in for loop:

    for (char ch = 'A'; ch <= 'Z'; ++ch) 
  map.put(String.valueOf(ch), 0);