ImmutableMap Does Not Allow null
An explanation of Guava ImmutableMap's null restrictions and the tradeoffs of alternative immutable map wrappers.
Tag: java
7 posts, newest first.
JAVA Understanding hashCode in Java
Notes on Java hashCode, its relationship with equals, and how collections use hash values.
Java Syntax and Runtime Error Notes
A diagnostic guide to Java enum switch labels, constant-expression requirements, and comparator contract violations.
IntelliJ IDEA Notes
An IntelliJ IDEA troubleshooting reference for indexing, Maven variables, Lombok, framework support, imports, and serialVersionUID.
Maven Notes
A Maven reference for coordinates, settings files, profile precedence, repository selection, and Aliyun mirror configuration.
Demonstrating That ArrayList and HashMap Are Not Thread-Safe
Reproducible Java examples that expose ArrayList and HashMap failures when multiple threads modify them concurrently.
Java Notes
A Java language notebook covering static initialization, inner classes, enums, object construction, and related runtime behavior.