Get-ChildItem -Recurse -Filter *.java | ForEach-Object {
    $b = [IO.File]::ReadAllBytes($_.FullName)
    if ($b.Length -ge 3 -and $b[0] -eq 0xEF -and $b[1] -eq 0xBB -and $b[2] -eq 0xBF) {
        Write-Output ("BOM: " + $_.FullName)
    }
}
Write-Output "scan done"