public SpotInstanceRequest withLaunchGroup(String launchGroup) {
        setLaunchGroup(launchGroup);
        return this;
    }
<p>
The instance launch group. Launch groups are Spot Instances that launch together and terminate together.
</p>

@param launchGroup
       The instance launch group. Launch groups are Spot Instances that launch together and terminate together.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/SpotInstanceRequest.java