ClassLoader類setPackageAssertionStatus()方法 (ClassLoader Class setPackageAssertionStatus() method)

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

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

• setPackageAssertionStatus() method is used to sets the package assertion status for the named package and this default status determines the classes instantiated in the future belong to named package or any of its child package.

  setPackageAssertionStatus()方法用于設置命名程序包的程序包斷言狀態，此默認狀態確定將來實例化的類屬于命名程序包或其任何子程序包。

• setPackageAssertionStatus() 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.

  setPackageAssertionStatus()方法是一個非靜態方法，只能使用類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• setPackageAssertionStatus() method does not throw an exception at the time of the set assertion status of the package.

  setPackageAssertionStatus()方法在設置包的聲明狀態時不會引發異常。

Syntax:

句法：

    public void setPackageAssertionStatus (String pack_name, boolean status);

Parameter(s):

參數：

• String pack_name – represents the name of the package whose default assertion status is to be set.

  字符串pack_name –表示要設置其默認斷言狀態的程序包的名稱。

• boolean status – It sets true when class loaded by this loader and belongs to the given named package will have assertion true by default otherwise it returns false.

  布爾狀態 –當此加載器加載的，屬于給定命名包的類默認為true時，設置為true，否則返回false。

Return value:

返回值：

The return type of this method is void, it returns nothing.

此方法的返回類型為void ，不返回任何內容。

Example:

例：

// Java program to demonstrate the example 
// of void setPackageAssertionStatus () method of ClassLoader 
public class setPackageAssertionStatusOfClassLoader {
public static void main(String[] args) throws Exception {
// Load a class
Class cl = Class.forName("setPackageAssertionStatusOfClassLoader");
// It returns the ClassLoader associated with the
// class Object
ClassLoader loader = cl.getClassLoader();
// Display loader
System.out.println("loader Class: " + loader.getClass());
// By using setPackageAssertionStatus() method is to set the 
// assertion status of the given package
loader.setPackageAssertionStatus("java.util", true);
}
}

Output

輸出量

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

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