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java

Java programming language and development

DatabasesMySQL JDBC Connection Refused Error: Troubleshooting Guide

Troubleshoot MySQL JDBC connection refused errors when command-line MySQL works. Learn about bind-address, IPv6/IPv4 conflicts, firewall issues, and solutions.

1 answer• 2 views
ProgrammingEfficiently Iterate Java Map: entrySet() Guide

Learn the most efficient way to iterate over Java Map entries using entrySet(), Java 8 forEach, and streams. Avoid keySet() lookups for better performance. Covers HashMap ordering and safe removal.

1 answer• 6 views
ProgrammingWhy Java compound assignment operators don't require casting

Java compound assignment operators (+=, -=, *=, /=) implicitly cast the promoted result back to the left-hand type, so i += j compiles without an explicit cast.

1 answer• 5 views
ProgrammingWhy sorted arrays run faster: branch prediction, cache

Why processing a sorted array is faster: fewer branch mispredictions, improved vectorization and cache locality. C++/Java benchmarks and fixes. Practical fixes.

1 answer• 7 views