- HashMap ConcurrentModificationException
testMap.keySet => Set.copyOf(testMap.keySet())
https://velog.io/@yrc97/JAVA-HashMap-ConcurrentModificationException-%EB%B0%9C%EC%83%9D-keySet-%EC%82%AC%EC%9A%A9%EC%8B%9C
[JAVA] HashMap ConcurrentModificationException 발생 (keySet 사용시)
제가 JAVA 의 Map(HashMap)을 사용하다가 ConcurrentModificationException가 발생한 경우 중 Map.keySet()과 관련된 경우를 공유합니다.위와 같은 상황에서 ConcurrentModificationException가 발생했습니다
velog.io
- Map
https://www.techiedelight.com/remove-null-values-map-java/
Remove null values from a Map in Java | Techie Delight
This post will discuss how to remove null values from a map in Java using plain Java, Guava library, and Apache Commons Collections.
www.techiedelight.com
How to remove null or empty list from an "unmodifiable" map
I have an unmodifiable map (Map<String, Object>). This contains a key-value pair, where the value should be a List, but for a specific key the value is an empty List. How can I remove that ...
stackoverflow.com
https://stackoverflow.com/questions/47355185/java-8-stream-api-filter-out-empty-value-from-map
java 8 stream API filter out empty value from map
i have a map, need to operate on each entry's value, and return the modified map. I managed to get it working, but the resulted map contains entries with empty value, and I want to remove those ent...
stackoverflow.com
- List
https://www.techiedelight.com/remove-empty-strings-from-list-java/
Remove empty strings from a List of strings in Java | Techie Delight
This post will discuss how to remove empty strings from a List of strings in Java... The removeAll() method is commonly used to remove all the elements from the list that are contained in the specified collection.
www.techiedelight.com
How to efficiently remove all null elements from a ArrayList or String Array?
I try with a loop like that // ArrayList tourists for (Tourist t : tourists) { if (t != null) { t.setId(idForm); } } But it isn't nice. Can anyone suggest me a better sol...
stackoverflow.com
'java' 카테고리의 다른 글
| List나 Object[]에서 generic type 가져오기 (0) | 2023.10.26 |
|---|---|
| change annotation value at runtime (0) | 2023.10.24 |
| get all classes-classLoader (0) | 2023.10.13 |
| 정규표현식 (0) | 2023.08.18 |
| 정규식 이용한 마스킹 처리 (0) | 2023.08.18 |
