[FIXED] How to throw an Exception in a Consumer Java 8

Issue

Is there any way to throw an Exception while using a consumer in java 8?

For example:

    private void fooMethod(List<String> list) throws Exception {

    list.forEach(element->{
        if(element.equals("a")) {
            throw new Exception("error!");
        }
    });

}

This gives me a compiler error saying: Unhandled exception type Exception

What is the correct way to throw an exception in this case?

Solution

Since Exception and its subclass (other than RuntimeException) are checked Exception and in lambda, you can't throw checked exception. Hence you should use RuntimeException:

private void fooMethod(List<String> list) throws Exception {
    list.forEach(element->{
        if(element.equals("a")) {
            throw new RuntimException("error!");
        }
    });
}

Answered By - Sourav Jha

Answer Checked By - Robin (PHPFixing Admin)