Attribute value must be constant !!!

When I’m going to use constant as a parameter from an Enum I got this compilation error.’ Attribute value must be constant’

This is the Enum class,

public enum Fruits {
    APPLE("A", "Apple");
    ORANGE("O", "Orange");
    String code;
    String value;

    Fruits(String code, String value) {
        this.code = code;
        this.value = value;
    }

    public static String getValue(String code) {
        for (Fruits b : Fruits.values()) {
            if (b.code.equalsIgnoreCase(code)) {
                return b.value;
            }
        }
        return null;
       }
    }

When we access an Enum value using Fruits.APPLE.getValue(), it will show as and error as Attribute value must be constant.

To resolve this error what we can add a constant class in to Enum class. like this

public enum Fruits {
    APPLE("A", Constants.APPLE_VALUE );
    ORANGE("O",Constants.ORANGE_VALUE);
    String code;
    String value;

    Fruits(String code, String value) {
        this.code = code;
        this.value = value;
    }

    public static String getValue(String code) {
        for (Fruits b : Fruits.values()) {
            if (b.code.equalsIgnoreCase(code)) {
                return b.value;
            }
        }
        return null;
       }
public static class Constants {
        public static final String APPLE_VALUE = "Apple";
        public static final String ORANGE_VALUE = "Orange";
    } 
}