在Java中，计算一个字符串中每个字符出现次数

public class CheckWord {

    public static void main(String[] args) {
        
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一串字符：");
        String word = input.next();
        showWord(word);
    }

    
    private static void showWord(String word) {
        
        HashMap map = new HashMap();

        
        for (int i = 0; i < word.length(); i++) {
            
            char atr = word.charAt(i);

            
            if (!map.containsKey(atr)) {
                
                map.put(atr, 1);
            } else {
                
                int count = map.get(atr);
                map.put(atr, count + 1);
            }
        }

        
        Set> entrySets = map.entrySet();
        for (Map.Entry entry : entrySets) {
            System.out.println(entry.getKey() + " : " + entry.getValue());
        }
    }

}

请输入一串字符：
alibababilibili
a : 3
b : 4
i : 5
l : 3