Fix: java.lang.UnsupportedOperationException Java Collections (List, Set, Map)

package org.code2care.exceptions;

import java.util.Arrays;
import java.util.List;

public class UnsupportedOperationExceptionExample1 {

    public static void main(String[] args) {

        List<String> nameList = Arrays.asList("Sam", "Alex", "Mike", "Annie", "Jane");
        nameList.add("Andrew");

    }

}

public class UnsupportedOperationExceptionExample2 {

    public static void main(String[] args) {

        List<String> nameList = LinkedList.of("Sam", "Alex", "Mike", "Annie", "Jane");
        nameList.add("Andrew");

    }

}

public class UnsupportedOperationExceptionExample3 {

    public static void main(String[] args) {

        Set<Integer> numbers = Set.of(10,20,30,40,50);
        numbers.add(44);

    }

}

All the three above examples will give java.lang.UnsupportedOperationException because when you make use of Arrays.asList() or the Collection.of() methods you get an immutable collection, thus you cannot modify such collection by adding, deleting our updating it.

Fix: java.lang.UnsupportedOperationException

The fix is simple, just create the collection as you do use the new keyword and add elements using the add method(s).

Example:

public class FixUnsupportedOperationException {

    public static void main(String[] args) {

        List<String> nameList = new ArrayList();
        nameList.add("Sam");
        nameList.add("Alex");
        nameList.add("Mike");
        nameList.add("Annie");
        nameList.add("Jane");

        nameList.add("Andrew"); //No issue

    }

}

Comments & Discussion

Facing issues? Have questions? Post them here! We're happy to help!

Load Comments

Provide Feedback For This Article

We take your feedback seriously and use it to improve our content. Thank you for helping us serve you better!

Helpful Not Helpful

Thanks for your feedback! If you have time, please provide details by selecting options below.

Submit Feedback

😊 Thanks for your time, your feedback has been registered!