類的類getClassLoader()方法 (Class class getClassLoader() method)

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

  getClassLoader()方法在java.lang包中可用。

• getClassLoader() method is used to return the ClassLoader that loads the class or interface.

  getClassLoader()方法用于返回加載類或接口的ClassLoader。

• getClassLoader() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  getClassLoader()方法是一個(gè)非靜態(tài)方法，只能通過(guò)類對(duì)象進(jìn)行訪問(wèn)，如果嘗試使用類名稱訪問(wèn)該方法，則會(huì)收到錯(cuò)誤消息。

• getClassLoader() method may throw SecurityException at the time of loading class or interface.

  在加載類或接口時(shí)， getClassLoader()方法可能會(huì)引發(fā)SecurityException 。

  SecurityException: In this exception, its checkPermission() method does not allow access classloader for the class when the security manager exists.

  SecurityException ：在此異常中，當(dāng)安全管理器存在時(shí)，其checkPermission()方法不允許訪問(wèn)該類的類加載器。

Syntax:

句法：

public ClassLoader getClassLoader();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

Return value:

返回值：

The return type of this method is ClassLoader, it returns the following values based on the given cases,

此方法的返回類型為ClassLoader ，它根據(jù)給定的情況返回以下值：

• It returns class loader that loads the class denoted by this object.

  它返回類加載器，該加載器加載此對(duì)象表示的類。

• It returns null in case of bootstrap class loader because we don't need to implement bootstrap class loader.

  如果使用自舉類加載器，則返回null ，因?yàn)槲覀儫o(wú)需實(shí)現(xiàn)自舉類加載器。

Example:

例：

// Java program to demonstrate the example // of ClassLoader getClassLoader() method of Class public class GetClassLoaderOfClass {public static void main(String[] args) throws Exception {// It returns the Class object attached with the given //classnameClass cl = Class.forName("GetClassLoaderOfClass");// By using getClassLoader() is to load the classClassLoader class_load = cl.getClassLoader();// If any ClassLoader associate with the Classif (class_load != null) {Class load_class = class_load.getClass();System.out.print("Associated Loader Class: ");System.out.print(load_class.getName());}// No Loader associated with the classelseSystem.out.println("No system loader associated with the class");} }

Output

輸出量

Associated Loader Class: jdk.internal.loader.ClassLoaders$AppClassLoader

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

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