public void setExpressionAttributeNames(java.util.Map<String, String> expressionAttributeNames) {
        this.expressionAttributeNames = expressionAttributeNames;
    }
<p>
One or more substitution tokens for attribute names in an expression.
</p>

@param expressionAttributeNames
       One or more substitution tokens for attribute names in an expression.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/model/Put.java