java

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.

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

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