JVM Tutorials - Herong's Tutorial Examples - v5.13, by Herong Yang
Loading Native Libraries
This section provides a tutorial example on how to load native libraries (DLL files on Windows systems) with loadLibrary() and load() methods.
The JVM instance also allows you to load native libraries into the system to support native methods by using loadLibrary() and load() methods:
Here is tutorial example program testing loadLibrary() and load() methods:
/* RuntimeLoadLibrary.java
* Copyright (c) HerongYang.com. All Rights Reserved.
*/
class RuntimeLoadLibrary {
public static void main(String[] a) {
java.io.PrintStream out = System.out;
Runtime rt = Runtime.getRuntime();
try {
out.println("Loading a native library...");
// rt.loadLibrary("msvcr71"); // c:/local/jdk/bin/msvcr71.dll
rt.loadLibrary("java"); // c:/local/jdk/bin/java.dll
out.println("Loading a native code...");
rt.load("c:/local/jdk/bin/java.exe");
} catch (Exception e) {
e.printStackTrace();
}
}
}
When executed with JVM in JDK, I got this result, assuming that java.dll and java.exe are exists in folder: \local\jdk\bin:
herong> java RuntimeLoadLibrary Loading a native library... Loading a native code...
The test result tells me that:
I don't have any example programs for calling native methods provided in native libraries yet.
Table of Contents
JVM (Java Virtual Machine) Specification
Java HotSpot VM - JVM by Oracle/Sun
►java.lang.Runtime Class - The JVM Instance
Printing Runtime Basic Information
Running the Garbage Collector Explicitly
Shutting Down or Terminating the JVM Instance
java.lang.System Class - The Operating System
ClassLoader Class - Class Loaders
Class Class - Class Reflections
JVM Stack, Frame and Stack Overflow
Thread Testing Program and Result
CPU Impact of Multi-Thread Applications
I/O Impact of Multi-Thread Applications
Micro Benchmark Runner and JVM Options
Micro Benchmark Tests on "int" Operations
Micro Benchmark Tests on "long" Operations
Micro Benchmark Tests in JIT Compilation Mode
Micro Benchmark Tests on "float" and "double" Operations