Class-Example.ps1

Class ComputerObject {

    [string]$ComputerName
    [string]$OsCaption

    ComputerObject() {
        $this.ComputerName = (Get-CimInstance CIM_ComputerSystem).Name
        $this.OsCaption = (Get-CIMInstance CIM_OperatingSystem).Caption
    }

    ComputerObject([String]$ComputerName) {
        $session = New-CimSession -ComputerName $ComputerName
        $cimComSys = Get-CimInstance CIM_ComputerSystem
        $cimOpSys = Get-CimInstance CIM_OperatingSystem

        $this.ComputerName = $cimComSys.Name
        $this.OsCaption = $cimOpSys.Caption
    }

    [void]ConvertToFQDN() {
        $this.ComputerName = $this.ComputerName + '.' + $env:USERDNSDOMAIN
    }

}