操作Map

For 循環map的entrySet

for (Map.Entry<String, String> book: bookMap.entrySet()) {
    System.out.println("key: " + book.getKey() + " value: " + book.getValue());
}

Iterator 循環map的entrySet

Iterator<Map.Entry<String, String>> _lineIt = _lineMap.entrySet().iterator();

while(_lineIt.hasNext()) {
    Map.Entry<String, String> itemMap = _lineIt.next();
}

For  循環keySet

  for (String key : map.keySet()) {    
   System.out.println("key= "+ key + " and value= " + map.get(key));    
  }   

For 循環map的values

  for (String v : map.values()) {    
   System.out.println("value= " + v);    
  }

過濾Map

Map<S