EnumSet.range(K, K) in Java

EnumSet.range(K, K): This method is available in java.util.EnumSet class of Java.

Syntax:

<K> EnumSet<K> java.util.EnumSet.range(K from, K to)

This method takes two arguments. This method creates an enum set initially containing all of the elements in the range defined by the two specified endpoints.

Parameters: Two parameters are required for this method.

from: the first element in the range.

to: the last element in the range.

Returns: an enum set initially containing all of the elements in the range defined by the two specified endpoints

Throws:

1. NullPointerException - if from or to is null.

2. IllegalArgumentException - if from.compareTo(to) > 0

Approach 1: When no exception

Java

import java.util.EnumSet;

public class EnumSetrange {
    public enum Colour {
        RED, GREEN, YELLOW, ORANGE
    };

    public static void main(String[] args) {

        Colour from = Colour.RED, to = Colour.YELLOW;
        System.out.println(EnumSet.range(from, to));

    }
}

Output:

[RED, GREEN, YELLOW]

Approach 2: NullPointerException 

Java

import java.util.EnumSet;

public class EnumSetrange {
    public enum Colour {
        RED, GREEN, YELLOW, ORANGE
    };

    public static void main(String[] args) {

        Colour from = Colour.RED, to = null;
        System.out.println(EnumSet.range(from, to));

    }
}

Output:

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "Object.getClass()" because "other" is null
	at java.base/java.lang.Enum.compareTo(Enum.java:198)
	at java.base/java.util.EnumSet.range(EnumSet.java:361)
	

Approach 3: IllegalArgumentException 

Java 

import java.util.EnumSet;

public class EnumSetrange {
    public enum Colour {
        RED, GREEN, YELLOW, ORANGE
    };

    public static void main(String[] args) {

        Colour from = Colour.YELLOW, to = Colour.RED;
        System.out.println(EnumSet.range(from, to));

    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: YELLOW > RED
	at java.base/java.util.EnumSet.range(EnumSet.java:362)