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Very simple Java JNI demo

create JNI bindings

javac -h . Display.java

compile c

gcc -I"/opt/java11/include/" -I"/opt/java11/include/linux" -lc -shared -o libDisplay.so Display.c

compile java

javac Display.java

run test

java -Djava.library.path=. Display

clean

rm Display.h libDisplay.so Display.class