停止一个AWS EC2实例在Java

Question

一个CloudWatch的警报到目前为止，我已成立了以这样的方式报警：

dim = new Dimension() 
     .withName("InstanceId") 
     .withValue(hashedId); 

alarmreq = new PutMetricAlarmRequest() 
       .withDimensions(dim) 
       .withMetricName(metricName) 
       .withNamespace(nameSpace) 
       .withAlarmName(alarmName) 
       .withActionsE