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 TestIs 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
Is A an annotation: true
参考资料: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#isAnnotation-
