Java Collection - 如何创建String到您自己的类型映射

import java.util.HashMap;
import java.util.Map;

public class Main {

  public static void main(String... args) {
    Map<String, MyData> map = new HashMap<String, MyData>();
    map.put("A", new MyData());

    System.out.println(map);
  }
}

class MyData {
  String theString;
  byte[] theBitmap;
  int theInt;
  
}