从源码分析Integer缓存机制IntegerCache和自动拆箱装箱解析IntegerCache

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概述

Integer的自动拆箱装箱解析

IntegerCache
自动拆箱与装箱
- 自动装箱
- 自动拆箱
基本类与封装类

IntegerCache

IntegerCache是Integer类中的静态内部类，用于缓存数据便于节省内存、提高性能。下面给出IntegerCache的源码：


    /**
     * Cache to support the object identity semantics of autoboxing for values between
     * -128 and 127 (inclusive) as required by JLS.
     *
     * The cache is initialized on first usage.  The size of the cache
     * may be controlled by the {@code -XX:AutoBoxCacheMax=<size>} option.
     * During VM initialization, java.lang.Integer.IntegerCache.high property
     * may be set and saved in the private system properties in the
     * sun.misc.VM class.
     */