类的类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()方法用于返回此类的包，我们使用类加载器找到该类的包。 假设当引导类加载器加载该类时，将搜索从CLASSPATH加载的软件包捆绑包，以确定该类的软件包。

• 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()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

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

  返回Package类型的对象时， getPackage()方法不会引发异常。

Syntax:

句法：

    public Package getPackage();

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

此方法的返回类型为Package ，它根据以下给定情况返回以下值：

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

  它返回由该类的类加载器加载的类的Package。

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

  当此Class的类加载器未加载任何包时，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 object
Class cl = Class.forName("java.util.ArrayList");
// It return the package of the class ArrayList
Package pack = cl.getPackage();
// Display Package Name
System.out.print("ArrayList defined in the: ");
System.out.println(pack);
}
}

Output

输出量

ArrayList defined in the: package java.util

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