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

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

  getPackage()方法在java.lang包中可用。

• getPackage() method is used to return the package of this class, we find the package of the class by using class loader. Let suppose when the class was loaded by the bootstrap class loader the bundles of packages loaded from CLASSPATH are searched to determine the package of the class.

  getPackage()方法用于返回此類的包，我們使用類加載器找到該類的包。 假設當引導類加載器加載該類時，將搜索從CLASSPATH加載的軟件包捆綁包，以確定該類的軟件包。

• getPackage() 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.

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

• getPackage() method does not throw an exception at the time of returning an object of Package type.

  返回Package類型的對象時， getPackage()方法不會引發異常。

Syntax:

句法：

public Package getPackage();

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 Package, it returns the following values based on the below given cases,

此方法的返回類型為Package ，它根據以下給定情況返回以下值：

• It returns the Package of the class which is loaded by the class loader of this Class.

  它返回由該類的類加載器加載的類的Package。

• It returns null, when no package is loaded by the class loader of this Class.

  當此Class的類加載器未加載任何包時，它返回null。

Example:

例：

// Java program to demonstrate the example // of Package getPackage() method of Class public class GetPackageOfClass {public static void main(String[] args) throws Exception {// Get Class objectClass cl = Class.forName("java.util.ArrayList");// It return the package of the class ArrayListPackage pack = cl.getPackage();// Display Package NameSystem.out.print("ArrayList defined in the: ");System.out.println(pack);} }

Output

輸出量

ArrayList defined in the: package java.util

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

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