A method with no statements inside and ends with a semicolon
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That's a declaration for a native method, indicated by the native modifier, as explained in the Java Language Specification, section §8.4.3.4 native Methods .
You won't find its implementing code in Java, it's referring to code that's either in the C libraries that are part of the implementation of the JDK in use, or part of a native library bundled with the code you're studying. Refer to the JNI documentation to understand how this gets called from a Java program.
The native keyword in Java signifies the method is written in another language. See this exact question: What is the native keyword in Java for?
the keyword native states that this method's implementation comes from a native language like c/cpp etc via JNI
A common example: a couple of methods in java.lang.Object class are implemented in native language.
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