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import proguard.annotation.*;
/**
* This application illustrates the use of annotations for configuring ProGuard.
*
* You can compile it with:
* javac -classpath ../lib/annotations.jar NativeCallBack.java
* You can then process it with:
* java -jar ../../../lib/proguard.jar @ ../examples.pro
*
* The annotation will preserve the class and its main method,
* as a result of the specifications in lib/annotations.pro.
*/
@KeepApplication
public class NativeCallBack
{
/**
* Suppose this is a native method that computes an answer.
*
* The -keep option for native methods in the regular ProGuard
* configuration will make sure it is not removed or renamed when
* processing this code.
*/
public native int computeAnswer();
/**
* Suppose this method is called back from the above native method.
*
* ProGuard would remove it, because it is not referenced from java.
* The annotation will make sure it is preserved anyhow.
*/
@Keep
public int getAnswer()
{
return 42;
}
/**
* The main entry point of the application.
*
* The @KeepApplication annotation of this class will make sure it is not
* removed or renamed when processing this code.
*/
public static void main(String[] args)
{
int answer = new NativeCallBack().computeAnswer();
System.out.println("The answer is " + answer);
}
}
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