类的类isEnum()方法 (Class class isEnum() method)

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

  isEnum()方法在java.lang包中可用。

• isEnum() method is used to check whether this Class is declared as an enum in the program or not.

  isEnum()方法用于检查此Class是否在程序中声明为枚举。

• isEnum() 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.

  isEnum()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• isEnum() method does not throw an exception at the time of checking the Class is declared as an enum.

  在检查Class声明为枚举时， isEnum()方法不会引发异常。

Syntax:

句法：

public boolean isEnum();

Parameter(s):

参数：

• It does not accept any parameter.

  它不接受任何参数。

Return value:

返回值：

The return type of this method is boolean, it returns a boolean value based on the following cases,

此方法的返回类型为boolean ，它基于以下情况返回布尔值：

• It returns true, when this Class is declared as an enum in the program.

  当此Class在程序中声明为枚举时，它返回true 。

• It returns false, when this Class is not declared as an enum in the program.

  当此Class在程序中未声明为枚举时，它返回false 。

Example:

例：

// Java program to demonstrate the example // of boolean isEnum() method of Class enum Fruits {
       Apple,    Orange,    Banana,    Grapes,};public class IsEnumOfClass {
       public static void main(String[] args) {
           // It returns the Enum constants represented by the         // class IsEnumOfClass        System.out.print("Enum Constants: ");        System.out.println(Fruits.Apple.toString());        System.out.print("Enum Constants: ");        System.out.println(Fruits.Orange.toString());        System.out.print("Enum Constants: ");        System.out.println(Fruits.Banana.toString());        System.out.print("Enum Constants: ");        System.out.println(Fruits.Grapes.toString());        // It checks whether this class         // denotes an enum declaration or not        System.out.println("Class declare enum: " + Fruits.class.isEnum());    }}

Output

输出量

Enum Constants: AppleEnum Constants: OrangeEnum Constants: BananaEnum Constants: GrapesClass declare enum: true

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