@Override
    public int hashCode() {
        int result = key != null ? key.hashCode() : 0;
        result = 31 * result + (value != null ? value.hashCode() : 0);
        return result;
    }
Set the tag value.

@param value
           The tag value.
@return
           This object for chaining.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/Tag.java