系統類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()方法用于使用名為library_name(library name)的給定參數作為在該方法中傳遞的參數來加載庫。

• 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.

  一個Java文件可能包含本機代碼，我們需要使用loadLibrary()方法來加載該庫。 在此方法中，以特定于系統的方式完成了從library_name到給定文件名的映射。 在類加載和實例化時，也將加載本機方法所需的已實現本機代碼。

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

  loadLibrary()方法是靜態方法，也可以使用類名進行訪問。

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

  在庫加載時， loadLibrary()方法可能會引發異常：

  • 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 ：在此異常中，當安全管理器存在時，其checkLink()方法不允許加載在方法中傳遞的指定庫。
  • UnsatisfiedLinkError: In this exception, if the loaded library does not exists.UnsatisfiedLinkError ：在這種情況下，如果加載的庫不存在。
  • NullPointerException: In this exception, if the loaded library is null.NullPointerException ：在此異常中，如果加載的庫為null。

Syntax:

句法：

    public static void loadLibrary(String library_name);

Parameter(s):

參數：

• String library_name – represents the name of the library.

  字符串library_name –代表庫的名稱。

Return value:

返回值：

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

此方法的返回類型為void ，它不返回任何內容。

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

輸出量

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

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