public final InCondition in(String... values) {
        List<LiteralOperand> list = new LinkedList<LiteralOperand>();
        for (String v: values)
            list.add(new LiteralOperand(v));
        return new InCondition(this, list);
    }
Returns an <a href=
"http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.SpecifyingConditions.html#ConditionExpressionReference.Functions"
>InCondition</a> (that evaluates to true if the value of the current
attribute is equal to any of the specified values) for building condition
expression.

@param values
           specified values. The number of values must be at least one
           and at most 100.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/xspec/S.java