JNI and Reflection in Android
http://docs.oracle.com/javase/7/docs/api/java/lang/reflect/package-summary.html
JNI: JNI函式其實和定義該JNI函式的類的其它函式沒有什麼區別,是屬於該類的一個函式而已,只是是由原生代碼實現的,所以JNI函式訪問該類的其它資料成員和成員函式時,沒有private/protect/public的限制。
http://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/functions.html
Reflection: 反射是將類的資料成員和成員函式都用相應的類來表示。
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