Convert proc.HasExited from C#.Net to Java

Hi all,

I have a C#.Net console app code that transfers files between linux and windows ftp servers.

The code's behavior is that I automatically open a console to display status of the file transfer. While transferring files to and from the windows server, I need to display an indicator that the file transfer is on-going (using symbols that look like they are moving or turning) . These symbols are as follows : "|" --> "/" --> "-" --> "\" --> "|"

There had been no problem displaying the said "indicator/symbols" in C#.Net using the following codes :

ProcessStartInfo PSI = new ProcessStartInfo("CMD.exe", "/C [here is the call to psftp / ftp scripts]");

String SymbolChar = "|";
Process proc = Process.Start(PSI);

while (true)
{
Thread.sleep(20);

if (proc.HasExited)
{
Console.WriteLine("\b-> Done\n");
break;
}
else
{
SymbolChar = NextChar(SymbolChar);
Console.Write("\b{0}", SymbolChar);
}
}
StreamReader srError = proc.StandardError;
StreamReader srOutput = proc.StandardOutput;

//method used to animate status during process
private static String NextChar(String sCurrentChar)
{
String sTempChar = "";

if (sCurrentChar.equals("|")) {
sTempChar = "/";
}
else if (sCurrentChar.equals("/")) {
sTempChar = "-";
}
else if (sCurrentChar.equals("-")) {
sTempChar = "\\";
}
else if (sCurrentChar.equals("-")) {
sTempChar = "\\";
}
else if (sCurrentChar.equals("\\")) {
sTempChar = "|";
}

return sTempChar;
}

My problem started when I converted the said codes into java using the following :

String sParam = "bash " + [here is the call to psftp / ftp scripts];
String cmd[] = {"/bin/bash","-c",sParam};
Process proc = Runtime.getRuntime().exec(cmd);

Above code is perfectly working.
Problem is I don't know how to display the "animated" characters anymore.
I suddenly don't know (and I badly need help on) how to convert this :

Process proc = Process.Start(PSI);

while (true)
{
Thread.sleep(20);

if (proc.HasExited)
{
Console.WriteLine("\b-> Done\n");
break;
}
else
{
SymbolChar = NextChar(SymbolChar);
Console.Write("\b{0}", SymbolChar);
}
}

Do you have any idea as to what I can use for the line "if (proc.HasExited)" in java so that I could move forward?

Sorry for the long explanation.
I really, really need help.

Thank you very much in advance!