题解 | #统计一句话中重复单词的个数#

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String line = scanner.nextLine();
        //hashMap的使用
        Map<Character, Integer> map = new LinkedHashMap<Character, Integer>();
        
        //遍历字符串
        int i;
        for(i=0;i<=line.length()-1;i++){
            char ch=line.charAt(i);
            //判断是否为字母
            if(ch>='a'&&ch<='z'||ch>='A'&&ch<='Z'){
                //如果哈希表中存在该字符
                if(map.containsKey(ch)==true){
                    //将哈希表中的该字符数+1
                    map.put(ch,map.get(ch)+1);
                }
                //哈希表中不存在该字符
                else{
                    //将该字符加入哈希表
                    map.put(ch,1);   
                }
                
            }
        }
        
        //write your code here......
        Set<Map.Entry<Character, Integer>> entrys = map.entrySet();
        for (Map.Entry<Character, Integer> entry : entrys) {
            System.out.println(entry.getKey() + ":" + entry.getValue());
        }
    }
}