public void setRegionNames(java.util.Collection<String> regionNames) {
        if (regionNames == null) {
            this.regionNames = null;
            return;
        }

        this.regionNames = new com.amazonaws.internal.SdkInternalList<String>(regionNames);
    }
<p>
The names of the Regions. You can specify any Regions, whether they are enabled and disabled for your account.
</p>

@param regionNames
       The names of the Regions. You can specify any Regions, whether they are enabled and disabled for your
       account.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/DescribeRegionsRequest.java