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

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

  isAnnotation()方法在java.lang包中可用。

• isAnnotation() method is used to check whether this Class object represents the annotation type or not.

  isAnnotation()方法用于檢查此Class對象是否表示注釋類型。

• isAnnotation() 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.

  isAnnotation()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。

• isAnnotation() method does not throw an exception at the time of returning the Annotation type.

  返回Annotation類型時， isAnnotation()方法不會引發異常。

Syntax:

句法：

public boolean isAnnotation();

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 boolean, it returns a boolean value based on the following cases,

此方法的返回類型為boolean ，它基于以下情況返回布爾值：

• It returns true, when this Class object denotes an annotation type.

  當此Class對象表示注釋類型時，它返回true 。

• It returns false, when this Class object does not denote an annotation type.

  當此Class對象不表示注釋類型時，它返回false 。

Example:

例：

// Java program to demonstrate the example // of boolean isAnnotation() method of Class import java.security.*; public class NonAnnoClass {public static void main(String[] args) throws Exception {Class ann1 = Identity.class;Class ann2 = Deprecated.class;// We are checking Annotation type of Deprecated class// by using the method isAnnotation()boolean b = ann2.isAnnotation();System.out.println("Is Deprecated an Annotation type" + " " + b);// We are checking Annotation type of Identity class// by using the method isAnnotation()if (ann1.isAnnotation()) {System.out.print(ann1.getSimpleName() + "is an Annotation type.");System.out.println(ann1.isAnnotation());} else {System.out.print(ann1.getSimpleName() + " " + "is an Annotation type" + " ");System.out.println(ann1.isAnnotation());}} }

Output

輸出量

Is Deprecated an Annotation type true Identity is an Annotation type false

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

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