How to run batch command in java?

Question

Hi, my program needs to use an outside batch file command, for instance, its name is "generateXML", its syntax is
[command prompt] : generateXML sourceFile.dtd XMLFile.xml
I want to include this command into my code so that do that and other things at one go.
Thanks

Answer 1

public class Test{
public static String genXML() throws IOException{
    Process p = Runtime.getRuntime.exec( "generateXML sourceFile.dtd   XMLFile.xml" );
    try{
        p.waitFor();
    }catch( InterruptedException ie ){}
    InputStream err = p.getErrorStream();
    int ctr = 0;
    if ( (ctr = err.available()) > 0 ){
       byte[] buf = new byte[ ctr ];
       throw new IOException( "Process failed with error:\n" + new String( buf, 0, ctr );
    String str = "Process was successful...Output was:\n";
    InputStream output = p.getInputStream();
    if ( (ctr = output.available()) > 0 ){
       byte[] buf = new byte[ ctr ];
       str += new String( buf, 0, ctr );
    return str;