Java Software Development

Create sequence diagrams from use cases at runtime

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Metrics collection

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Java Urban Performance Legends When is it important to set the default collection sizes? What is the time cost of growing an ArrayList? What is the time cost of growing/rehashing a HashMap with defaults from zero to 'n' entries? initial capacity 16, load factor .75 growth algorithm if (size++ >= threshold) resize(2 * table.length) size should always be power of 2 0-1 million objects ? sec 0-10 million objects ? sec 0-20 million objects - it takes three times the current size to rehash since it doubles the internal array and copies the old array - with a 700M heap couldn't rehash 20 M objects without running out of memory 0-20 million objects with 1 GB heap ? sec Is synchronization expensive? What is the time cost of un-contented synchronization? What is the time cost of contended synchronization? When would pooling of objects yield significant performance gains? How much memory do empty objects require? How much time do objec...

Evolution of Test and Code Via Test-First Design TDD debate Coplien and Martin - architecture TDD makes you faster Uncle Bob's three rules of TDD