import java.util.HashMap; import java.util.Scanner; public class Demo01Map {
      public static void main(String[] args) {
          //1,使用Scanner获得用户输入的字符串         Scanner scanner = new Scanner(System.in);         System.out.println("请输入一个字符串");         String str = scanner.next();         //2,创建Map集合，kep是字符串的字符，value是字符的个数         HashMap
    
      map =new HashMap<>();         //3,4         for(char c :str.toCharArray()){
              if(map.containsKey(c)){
                  Integer value =map.get(c);                 value++;                 map.put(c,value);             }else{
                  map.put(c,1);             }         }         for(Character key :map.keySet()){
              Integer value = map.get(key);             System.out.println(key+"="+value);         }     } }