Surce Code Java mengubah Spasi menjadi underscore

Berikut adalah contoh source code Java mengubah karakter spasi dalam file teks menjadi karakter underscore atau "_"

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import java.io.*;


public class UbahFile
{
public UbahFile(String sumber, String tujuan)
{
FileInputStream fis = null;
try
{
fis = new FileInputStream(sumber);
}catch(FileNotFoundException ex)
{
System.out.println("File Not Found");
}

try
{
char data;
int temp;
FileOutputStream fos;
fos = new FileOutputStream(tujuan);
do
{
temp = fis.read();
data = (char)temp;
if(temp != -1)
{
try
{
if((char)temp == ' ')
{
data = '_';
fos.write(data);
}else
{
fos.write(data);
}
}catch(FileNotFoundException ex)
{
System.out.println("File Cannot be opened for writing");
}
}
}while(temp != -1);

} catch(IOException ex)
{
System.out.println("Problem for reading of this file");
}
}

public static void main(String args[]) throws IOException
{
System.out.println("What is the name of the source file ?");
String sumber;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
sumber = br.readLine();
System.out.println("Enter data to write to "+sumber+"...");
System.out.println("What is the name of the aim file ?");
String tujuan;
BufferedReader bd = new BufferedReader(new InputStreamReader(System.in));
tujuan = bd.readLine();
System.out.println("Enter data to write to "+tujuan+"...");
new UbahFile(sumber,tujuan);

}
}