Java Class isAnnotation()方法及示例

java.lang.Class类 的 isAnnotation() 方法用于检查该类是否为注释类型。如果该类是注解类型，该方法返回true。否则返回false。
语法：

public boolean isAnnotation()

参数： 该方法不接受任何参数。

返回值： 如果这个Class是Annotation类型，该方法返回 true 。否则返回 false 。

下面的程序演示了isAnnotation()方法。

示例1：

// Java program to demonstrate isAnnotation() 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());
 
        // Check if this class is an annotation
        // using isAnnotation() method
        System.out.println("Is Test an annotation: "
                           + myClass.isAnnotation());
    }
}

输出

Class represented by myClass: class Test
Is Test an annotation: false

例2：

// Java program to demonstrate isAnnotation() method
 
// declaring an Annotation Type
@interface A {
    // Annotation element definitions
}
 
public class Test {
    public static void main(String[] args)
        throws ClassNotFoundException
    {
 
        // returns the Class object for A
        Class myClass = A.class;
 
        // Check if myClass is an annotation
        // using isAnnotation() method
        System.out.println("Is A an annotation: "
                           + myClass.isAnnotation());
    }
}

输出