Web Reference: Jul 15, 2025 · In this article, we will discuss Integer Cache. This feature was introduced in Java 5 in order to improve memory management. Let us first have a look at a sample code to better understand this behavior. Afterward, we'll discuss why this is implemented. Basically, the Integer class keeps a cache of Integer instances in the range of -128 to 127, and all autoboxing, literals and uses of Integer.valueOf() will return instances from that cache for the range it covers. Nov 10, 2025 · Welcome to the fascinating world of Integer Caching, a small but clever optimization built right into the Java Virtual Machine (JVM) that quietly boosts performance and saves memory.
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