public Field withKey(String key) {
        setKey(key);
        return this;
    }
<p>
The field identifier.
</p>

@param key
       The field identifier.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-datapipeline/src/main/java/com/amazonaws/services/datapipeline/model/Field.java