Java 中的类 isEnum()方法,带示例

原文:https://www . geesforgeks . org/class-isenum-in-Java-method-with-examples/

java.lang.Class 类isEnum() 方法用于检查该类是否是枚举类。如果此类是枚举类,则方法返回 true。否则返回 false。

语法:

public boolean isEnum()

参数:此方法不接受任何参数。

返回值:如果这个类是枚举类,这个方法返回。否则返回

下面的程序演示了 isEnum()方法。

例 1:

// Java program to demonstrate isEnum() 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 enum
        // using isEnum() method
        System.out.println("Is Test an enum: "
                           + myClass.isEnum());
    }
}

输出:

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

例 2:

// Java program to demonstrate isEnum() method

enum A {}

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 enum
        // using isEnum() method
        System.out.println("Is A an enum: "
                           + myClass.isEnum());
    }
}

输出:

Is A an enum: true

参考:https://docs . Oracle . com/javase/9/docs/API/Java/lang/class . html # isEnum–