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 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
// Java program to illustrate// isEnumConstant () methodimport 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: $VALUES; isEnumConstant: false
Program 2:
Java
// Java program to illustrate// isEnumConstant () methodimport java.lang.reflect.Field;public class GFG { public static void main(String[] args) throws NoSuchFieldException { // get all declared fields of Symbols class Field[] declaredFields = Symbols.class.getDeclaredFields(); // loop through Field array // and print Field name and // check whether the field is EnumConstant for (int i = 0; i < declaredFields.length; i++) { System.out.print( "Field --> Name: " + declaredFields[i].getName() + "; isEnumConstant: " + declaredFields[i] .isEnumConstant() + "\n"); } } private static enum Symbols { Alpha, Beta, Gamma }} |
Output:
Field --> Name: Alpha; isEnumConstant: true Field --> Name: Beta; isEnumConstant: true Field --> Name: Gamma; isEnumConstant: true Field --> Name: ENUM$VALUES; isEnumConstant: false
References: https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Field.html#isEnumConstant–
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