Java类类getClassLoader（）方法及示例

类的类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()方法用于返回加载类或接口的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()方法是一个非静态方法，只能通过类对象进行访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  在加载类或接口时， getClassLoader()方法可能会引发SecurityException 。

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

  SecurityException ：在此异常中，当安全管理器存在时，其checkPermission()方法不允许访问该类的类加载器。

Syntax:

句法：

    public ClassLoader getClassLoader();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

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

此方法的返回类型为ClassLoader ，它根据给定的情况返回以下值：

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

  它返回类加载器，该加载器加载此对象表示的类。

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

  如果使用自举类加载器，则返回null ，因为我们无需实现自举类加载器。

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 
  //classname
  Class cl = Class.forName("GetClassLoaderOfClass");

  // By using getClassLoader() is to load the class
  ClassLoader class_load = cl.getClassLoader();

  // If any ClassLoader associate with the Class
  if (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 class
  else
   System.out.println("No system loader associated with the class");
 }
}

Output

输出量

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

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