Java Class getPackage()用法及代碼示例

java.lang.Class類的getPackage()方法用於獲取此實體的包。該實體可以是類，數組，接口等。該方法返回該實體的包。

用法:

public Package getPackage()

參數：此方法不接受任何參數。

返回值：此方法返回此實體的包。

下麵的程序演示了getPackage()方法。

示例1:

// Java program to demonstrate getPackage() method 
  
public class Test { 
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
  
        // returns the Class object for this class 
        Class myClass = Class.forName("Test"); 
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString()); 
  
        // Get the Package of myClass 
        // using getPackage() method 
        System.out.println("Package of myClass: "
                           + myClass.getPackage()); 
    } 
}

輸出：

Class represented by myClass: class Test
Package of myClass: null

示例2:

// Java program to demonstrate getPackage() method 
  
public class Test { 
  
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
        // returns the Class object 
        Class myClass = Class.forName("java.lang.String"); 
  
        // Get the package of myClass 
        // using getPackage() method 
        System.out.println("Package of myClass: "
                           + myClass.getPackage()); 
    } 
}

輸出：

Package of myClass: package java.lang,
 Java Platform API Specification,
 version 1.8

參考： https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getPackage–

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