public void setPhysicalResourceId(String physicalResourceId) {
        this.physicalResourceId = physicalResourceId;
    }
<p>
The name or unique identifier that corresponds to a physical instance ID of a resource supported by
CloudFormation.
</p>
<p>
For example, for an Amazon Elastic Compute Cloud (EC2) instance, <code>PhysicalResourceId</code> corresponds to
the <code>InstanceId</code>. You can pass the EC2 <code>InstanceId</code> to <code>DescribeStackResources</code>
to find which stack the instance belongs to and what other resources are part of the stack.
</p>
<p>
Required: Conditional. If you don't specify <code>PhysicalResourceId</code>, you must specify
<code>StackName</code>.
</p>
<p>
Default: There is no default value.
</p>

@param physicalResourceId
       The name or unique identifier that corresponds to a physical instance ID of a resource supported by
       CloudFormation.</p>
       <p>
       For example, for an Amazon Elastic Compute Cloud (EC2) instance, <code>PhysicalResourceId</code>
       corresponds to the <code>InstanceId</code>. You can pass the EC2 <code>InstanceId</code> to
       <code>DescribeStackResources</code> to find which stack the instance belongs to and what other resources
       are part of the stack.
       </p>
       <p>
       Required: Conditional. If you don't specify <code>PhysicalResourceId</code>, you must specify
       <code>StackName</code>.
       </p>
       <p>
       Default: There is no default value.
aws-java-sdk-cloudformation/src/main/java/com/amazonaws/services/cloudformation/model/DescribeStackResourcesRequest.java