public String getKey() {
        return this.key;
    }
<p>
The key for the tag. Tag keys are case sensitive. Every DAX cluster can only have one tag with the same key. If
you try to add an existing tag (same key), the existing tag value will be updated to the new value.
</p>

@return The key for the tag. Tag keys are case sensitive. Every DAX cluster can only have one tag with the same
        key. If you try to add an existing tag (same key), the existing tag value will be updated to the new
        value.
aws-java-sdk-dax/src/main/java/com/amazonaws/services/dax/model/Tag.java