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Field isEnumConstant() method in Java with Examples
  • Last Updated : 17 Sep, 2019

The isEnumConstant() method of java.lang.reflect.Field used to check if this field represents an element of an enumerated type or not. If this field represents an element of an enumerated type then method returns true else false.

Syntax:

public boolean isEnumConstant()

Parameters: This method accepts accepts nothing.

Return: This method returns true if and only if this field represents an element of an enumerated type.

Below programs illustrate isEnumConstant () method:
Program 1:






// Java program to illustrate
// isEnumConstant () method
  
import java.lang.reflect.Field;
import java.time.Month;
  
public class GFG {
  
    public static void main(String[] args)
        throws NoSuchFieldException
    {
  
        // get all declared fields of Month class
        Field[] declaredFields
            = Month.class.getDeclaredFields();
  
        // loop through Field array
        // and print Field name and
        // check whether the field is EnumConstant
        for (int i = 0; i < declaredFields.length; i++) {
            System.out.print(
                "Field --> Name: "
                + declaredFields[i].getName()
                + "; isEnumConstant: "
                + declaredFields[i]
                      .isEnumConstant()
                + "\n");
        }
    }
}
Output:
Field --> Name: JANUARY; isEnumConstant: true
Field --> Name: FEBRUARY; isEnumConstant: true
Field --> Name: MARCH; isEnumConstant: true
Field --> Name: APRIL; isEnumConstant: true
Field --> Name: MAY; isEnumConstant: true
Field --> Name: JUNE; isEnumConstant: true
Field --> Name: JULY; isEnumConstant: true
Field --> Name: AUGUST; isEnumConstant: true
Field --> Name: SEPTEMBER; isEnumConstant: true
Field --> Name: OCTOBER; isEnumConstant: true
Field --> Name: NOVEMBER; isEnumConstant: true
Field --> Name: DECEMBER; isEnumConstant: true
Field --> Name: ENUMS; isEnumConstant: false
Field --> Name: $VALUES; isEnumConstant: false

Program 2:




// Java program to illustrate
// isEnumConstant () method
  
import java.lang.reflect.Field;
  
public class GFG {
  
    public static void main(String[] args)
        throws NoSuchFieldException
    {
  
        // get all declared fields of Symbols class
        Field[] declaredFields
            = Symbols.class.getDeclaredFields();
  
        // loop through Field array
        // and print Field name and
        // check whether the field is EnumConstant
        for (int i = 0; i < declaredFields.length; i++) {
            System.out.print(
                "Field --> Name: "
                + declaredFields[i].getName()
                + "; isEnumConstant: "
                + declaredFields[i]
                      .isEnumConstant()
                + "\n");
        }
    }
  
    private static enum Symbols {
        Alpha,
        Beta,
        Gamma
    }
}
Output:
Field --> Name: Alpha; isEnumConstant: true
Field --> Name: Beta; isEnumConstant: true
Field --> Name: Gamma; isEnumConstant: true
Field --> Name: ENUM$VALUES; isEnumConstant: false

References: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#isEnumConstant–

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