Passing values to a process

Question

hi everybody
i'm creating a java ide
the compile and run options are working file
however if i want to take input from user using some BufferedReader or DataInputStream classes, i need to send values from my ide to the Process that is executing the 'java' command. How can i do this?
hope you understand what my problem is:
the code i'm using to execute java command from my ide is:
int pos = MainWindow.tabpane.getSelectedIndex();
String filepath = MainWindow.tabpane.getTitleAt(pos);
String filecompletepath = MainWindow.tabpane.getToolTipTextAt(pos);
String javapath = "";
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader("javalocation.options4u"));
javapath = br.readLine();
if(javapath==null){
throw new Exception();
} catch (Exception exception) {
JOptionPane.showMessageDialog(null,"I guess java path is not set.\n Go to Action->Java Path...");
finally{
try {
br.close();
} catch (Exception exception) {
filepath = filepath.substring(0,filepath.indexOf("."));
String javafiledir = filecompletepath.substring(0,filecompletepath.lastIndexOf("\\"));
String runstr = javapath + "\\java -cp \".;" + javafiledir + "\" \"" + filepath + "\"";
System.out.println(runstr);
StringBuffer output= new StringBuffer() ;
InputStreamReader rdr = null;
try{
     Process pr = Runtime.getRuntime().exec(runstr);
     Thread.sleep(1000) ;
     pr.waitFor();
     InputStream in = pr.getInputStream() ;
     rdr = new InputStreamReader(in);
     br = new BufferedReader(rdr) ;
          String line = "";
          while (true) {
line = br.readLine();
if(line==null)
break;
else{
          System.out.println(line + '\n');
                    output.append( line +"\n" );
          } catch(Exception exc) {
JOptionPane.showMessageDialog(null,"I guess java path is not set.\n Go to Action->Java Path...");
          finally { 
try {
br.close();
rdr.close();
} catch (Exception exception) {
ResultWindow.txtresult.setText(output.toString());
}

Answer 1

Well, you have a process object returned by the exec command, so you should be able to open streams and do reads and writes. No?