public void setApplicationId(String applicationId) {
        this.applicationId = applicationId;
    }
<p>
The unique identifier for the application. This identifier is displayed as the <b>Project ID</b> on the Amazon
Pinpoint console.
</p>

@param applicationId
       The unique identifier for the application. This identifier is displayed as the <b>Project ID</b> on the
       Amazon Pinpoint console.
aws-java-sdk-pinpoint/src/main/java/com/amazonaws/services/pinpoint/model/GetAppRequest.java