public TrainingDataSchema withModelVariables(String... modelVariables) {
        if (this.modelVariables == null) {
            setModelVariables(new java.util.ArrayList<String>(modelVariables.length));
        }
        for (String ele : modelVariables) {
            this.modelVariables.add(ele);
        }
        return this;
    }
<p>
The training data schema variables.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setModelVariables(java.util.Collection)} or {@link #withModelVariables(java.util.Collection)} if you want
to override the existing values.
</p>

@param modelVariables
       The training data schema variables.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-frauddetector/src/main/java/com/amazonaws/services/frauddetector/model/TrainingDataSchema.java