对于本机代码，这对应于CPU的程序计数器。

For native code, this corresponds to the CPU's program counter.

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因此，对于 JNI 来说，本机代码从传递进来的对象中访问大量单独字段时会导致性能降低。

For JNI, therefore, causing the natives to reach for many individual fields from the objects passed to them leads to poorer performance.

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然而，解释url的方法及在本机代码的映射对于不同的平台来说是不同的。

However, the way that URLs are interpreted and mapped in the native code differs between platforms.

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