修改HashMap初始化容量，减少不必要的扩容，提高性能 #760
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修改HashMap初始化容量，减少不必要的扩容，提高性能 (elunez#760)
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自定义缓存key生成策略时，目前HashMap容量设置为4，按照JDK, 临界点在 4 * 0.75 =3时会触发扩容，也就是map中entry超过3时会自动扩容。
而方法中类地址，方法名称，包名称已经有3个了，只要“参数列表”不为空，必然会进行扩容，这样性能会受到影响，可以将初始化容量设为8或16，减少不必要的因为“参数列表”不为空而触发的扩容，提高性能。