ClassLoader類getSystemClassLoader()方法 (ClassLoader Class getSystemClassLoader() method)

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

  getSystemClassLoader()方法在java.lang包中可用。

• getSystemClassLoader() method is used to find the System class loader for delegation and this will be the default delegation parent for the new instance of the ClassLoader.

  getSystemClassLoader()方法用于查找要委派的系統類加載器，這將是ClassLoader新實例的默認委派父級。

• getSystemClassLoader() method is a static method, it is accessible with the class name and if we try to access the method with the class object then we will not get any error.

  getSystemClassLoader()方法是一個靜態方法，可以使用類名進行訪問，如果嘗試使用類對象訪問該方法，則不會出現任何錯誤。

• getSystemClassLoader() method may throw an exception at the time of checking security constraints.

  在檢查安全性約束時， getSystemClassLoader()方法可能會引發異常。

  • SecurityException: In this exception, its SecurityException ：在此異常中，當安全管理器存在時，其checkPermission() method does not allow access to the system classloader when the security manager exists.checkPermission()方法不允許訪問系統類加載器。
  • IllegalStateException: In this exception when called recursively during the construction of the class loader given by the property IllegalStateException ：在此異常中，當在構造由屬性"java.system.class.loader".“ java.system.class.loader”給出的類加載器期間遞歸調用時。

Syntax:

句法：

static ClassLoader getSystemClassLoader();

Parameter(s):

參數：

• It does not accept any parameter.

  它不接受任何參數。

Return value:

返回值：

The return type of this method is ClassLoader, it returns the system class loader of ClassLoader type.

該方法的返回類型為ClassLoader ，它返回ClassLoader類型的系統類加載器 。

Example:

例：

// Java program to demonstrate the example // of ClassLoader getSystemClassLoader() method of ClassLoader public class GetSystemClassLoader {public static void main(String[] args) throws Exception {// It returns the Class object attached with the given // classnameClass cl = Class.forName("GetSystemClassLoader");// It returns the ClassLoader object attached with the given // classnameClassLoader loader = cl.getClassLoader();// Display Loader ClassSystem.out.println(loader.getClass());// It returns the SystemClassLoader object attached with the // given classnameloader = loader.getSystemClassLoader();// Display SystemClassLoader ClassSystem.out.println(loader.getClass());} }

Output

輸出量

class jdk.internal.loader.ClassLoaders$AppClassLoader class jdk.internal.loader.ClassLoaders$AppClassLoader

翻譯自: https://www.includehelp.com/java/classloader-getsystemclassloader-method-with-example.aspx

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