Java Class getCanonicalName()用法及代碼示例

java.lang.Class類的getCanonicalName()方法用於獲取該類的規範名稱，該名稱是Java語言規範定義的規範名稱。該方法以String的形式返回此類的規範名稱。

用法:

public String getCanonicalName()

參數：此方法不接受任何參數。

返回值：此方法以String形式返回此類的規範名稱。

下麵的程序演示了getCanonicalName()方法。

示例1:

// Java program to demonstrate getCanonicalName() method 
  
import java.util.*; 
  
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 canonical name of myClass 
        // using getCanonicalName() method 
        System.out.println("CanonicalName of myClass: "
                           + myClass.getCanonicalName()); 
    } 
}

輸出：

Class represented by myClass: class Test
CanonicalName of myClass: Test

示例2:

// Java program to demonstrate getCanonicalName() method 
  
import java.util.*; 
  
class Main { 
  
    public Object obj; 
  
    Main() 
    { 
  
        class Arr { 
        }; 
  
        obj = new Arr(); 
    } 
  
    public static void main(String[] args) 
        throws ClassNotFoundException 
    { 
        Main t = new Main(); 
  
        // returns the Class object 
        Class myClass = t.obj.getClass(); 
  
        System.out.println("Class represented by myClass: "
                           + myClass.toString()); 
  
        // Get the canonical name of myClass 
        // using getCanonicalName() method 
        System.out.println("CanonicalName of myClass: "
                           + myClass.getCanonicalName()); 
    } 
}

輸出：

Class represented by myClass: class Main$1Arr
CanonicalName of myClass: null

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

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