【JNI】Find 'jni.h' for MacOS

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download jdk8 and install.
check java version:
 sodino:~ sodino$ java -version
 java version "1.8.0_45"
 Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
 Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

find ‘java’ original path and ‘java_home’:
 sodino:~ sodino$ which java
 /usr/bin/java
 sodino:~ sodino$ ls -n /usr/bin/java
 lrwxr-xr-x  1 0  0  74 Sep 30  2014 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
 sodino:~ sodino$    /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java_home 
 /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home

get ‘include’ folder and jni.hnow you will find a ‘include’ folder with in ‘/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home’,and open it ‘jni.h’ will be found.