Remove key-value pairs specified in the Map

// map the key (key) iterator object 
the Iterator <String> = myMap.keySet Iterator () Iterator ();. 
The while (iterator.hasNext ()) {// cycle taking key judgment 
    String key = iterator. next (); // key 
    IF (key.startsWith ( "Week")) { 
        the Iterator.remove (); // remove the key map to begin with a character corresponding to the key-value 
    } 
    IF (key.startsWith ( " lessonNo ")) { 
        the Iterator.remove (); // remove the key map corresponding to the beginning character of a key value 
    } 
} 



source: https://blog.csdn.net/qq_37584445/article/details/88681622