public void setPrincipals(java.util.Collection<String> principals) {
        if (principals == null) {
            this.principals = null;
            return;
        }

        this.principals = new java.util.ArrayList<String>(principals);
    }
<p>
The grant principals. You can specify one of the following as an Amazon Resource Name (ARN):
</p>
<ul>
<li>
<p>
An Amazon Web Services account, which includes only the account specified.
</p>
</li>
</ul>
<ul>
<li>
<p>
An organizational unit (OU), which includes all accounts in the OU.
</p>
</li>
</ul>
<ul>
<li>
<p>
An organization, which will include all accounts across your organization.
</p>
</li>
</ul>

@param principals
       The grant principals. You can specify one of the following as an Amazon Resource Name (ARN):</p>
       <ul>
       <li>
       <p>
       An Amazon Web Services account, which includes only the account specified.
       </p>
       </li>
       </ul>
       <ul>
       <li>
       <p>
       An organizational unit (OU), which includes all accounts in the OU.
       </p>
       </li>
       </ul>
       <ul>
       <li>
       <p>
       An organization, which will include all accounts across your organization.
       </p>
       </li>
aws-java-sdk-licensemanager/src/main/java/com/amazonaws/services/licensemanager/model/CreateGrantRequest.java