GitHub

Comparator in instance of TreeMap which has been deserialized from JSON is not java.io ...

When using vavr-jackson (0.9.2) to deserialize a TreeMap from JSON I get an instance back where the comparator apparently is not implementing "java.io.Serializable". Looking into the code the culprit ...
note

JAVA勉強サイト

一週間で身につくJava言語の基本 キーのクラスに実装されているComparableをベースにキーと値を管理する キーとしてnullを許容しない 厳密にはコンストラクタ引数でComparatorを渡し、そのComparatorがnullをサポートしている場合はTreeMapでもnullをキーとして使用 ...
GitHub

JDK - 16 - java.lang.reflect.InaccessibleObjectException: Unable to make field private ...

java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: module java.base does not "opens java.util" to unnamed ...
thetechedvocate.org

How to Use the Java TreeMap Data Structure

The TreeMap data structure in Java is one of the most commonly used data structures for sorting and associating values with keys. It’s based on the concept of a binary search tree, where each node in ...