April 2025
Intermediate to advanced
450 pages
14h 46m
Italian
Content preview from Prestazioni Java, 2a edizione
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Capitolo 12. Suggerimenti sulle API di Java SE
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Questo capitolo tratta le aree dell'API di Java SE che presentano delle stranezze di implementazione che ne influenzano le prestazioni. Molti di questi dettagli di implementazione sono presenti in tutto il JDK; sono le aree in cui scopro sempre problemi di prestazioni (anche nel mio codice). Questo capitolo include dettagli sul modo migliore di gestire le stringhe (e in particolare le stringhe duplicate); i modi per bufferizzare correttamente l'I/O; il caricamento delle classi e i modi per migliorare l'avvio delle applicazioni che utilizzano molte classi; l'uso corretto delle collezioni e le caratteristiche del JDK 8 come le Lambda e gli stream.
Corde
Le stringhe sono (senza sorpresa) l'oggetto più comune di Java. In questa sezione vedremo una serie di modi per gestire la memoria consumata dagli oggetti stringa; queste tecniche possono spesso ridurre significativamente la quantità di heap richiesta dal tuo programma. Inoltre, ci occuperemo di una nuova funzione delle stringhe del JDK 11 che riguarda la concatenazione.
Corde compatte
In Java 8, tutte le stringhe vengono codificate come array di caratteri a 16 bit, indipendentemente dalla codifica della stringa. Si tratta di uno spreco: la maggior parte dei locali occidentali può codificare le stringhe in array di byte a 8 bit e anche in un locale ...
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