系统类loadLibrary()方法 (System class loadLibrary() method)

• loadLibrary() method is available in java.lang package.

  loadLibrary()方法在java.lang包中可用。

• loadLibrary() method is used to load the library with the given parameter named library_name(library name) as an argument passed in the method.

  loadLibrary()方法用于使用名为library_name(library name)的给定参数作为在该方法中传递的参数来加载库。

• A java file may contain native code for that we need to load the library by using loadLibrary() method. In this method, the mapping from a library_name to a given file name is done in a system-specific manner. At the time of class loading and instantiating, the required implemented native code for the native methods will then be loaded as well.

  一个Java文件可能包含本机代码，我们需要使用loadLibrary()方法来加载该库。 在此方法中，以特定于系统的方式完成了从library_name到给定文件名的映射。 在类加载和实例化时，也将加载本机方法所需的已实现本机代码。

• loadLibrary() method is a static method, it is accessible with the class name too.

  loadLibrary()方法是静态方法，也可以使用类名进行访问。

• loadLibrary() method may throw an exception at the time of library loading:

  在库加载时， loadLibrary()方法可能会引发异常：

  • SecurityException: In this exception, its checkLink() method does not allow load the specified library as passed in the method when the security manager exists.SecurityException ：在此异常中，当安全管理器存在时，其checkLink()方法不允许加载在方法中传递的指定库。
  • UnsatisfiedLinkError: In this exception, if the loaded library does not exists.UnsatisfiedLinkError ：在这种情况下，如果加载的库不存在。
  • NullPointerException: In this exception, if the loaded library is null.NullPointerException ：在此异常中，如果加载的库为null。

Syntax:

句法：

    public static void loadLibrary(String library_name);

Parameter(s):

参数：

• String library_name – represents the name of the library.

  字符串library_name –代表库的名称。

Return value:

返回值：

The return type of this method is void, it does not return anything.

此方法的返回类型为void ，它不返回任何内容。

Example:

例：

// Java program to demonstrate the example of 
// loadLibrary() method of System Class
public class LoadLibraryMethod {
public static void main(String[] args) {
// load a library FP30TXT.dll that is in Windows/system folder*/
System.out.println(" Process of Library Loading ");
Runtime.getRuntime().loadLibrary("C:/Windows/system/FP30TXT.dll");
System.out.println("Process of Library Loading  completion");
}
}

Output

输出量

E:\Programs>javac LoadLibraryMethod.java
E:\Programs>java LoadLibraryMethod
Process of Library Loading
Process of Library Loading completion

翻译自: https://www.includehelp.com/java/system-class-loadlibrary-method-with-example.aspx