java - Why is my code to enter input to a batch file not working? -

i'm trying write loaded batch file process, cannot figure out how equivalent of return.

java code:

import java.io.datainputstream; import java.io.dataoutputstream; import java.util.scanner;  public class start {     public static void main(string[] args) {         try {             process p = runtime.getruntime().exec("c:\\users\\max\\desktop\\test.bat");// runtime.getruntime().exec("keytool -genkey -alias " + name.replace(" ", "").trim() + "  -keystore key");             datainputstream in = new datainputstream(p.getinputstream());             scanner scanner = new scanner(in);             // system.out.println(scanner.nextline());             dataoutputstream out = new dataoutputstream(p.getoutputstream());             out.write("test\n\n".getbytes());             out.flush();             out.close();         }catch (exception e) {             e.printstacktrace();         }     } } 

batch code:

@echo off set /p delbuild=lozors?:  echo test >> test.txt 

when run, should output text file on desktop... doesn't seem take input? i've tried using \n , \n\n, writing , flushing, doesn't work. ideas?

firstly, appologise, i'm not batch developer , it's being long time since i've done (serious) batch coding, didn't recognize set /p command...

there might number of reason why code isn't working, obvious thing stands out command in batch file...

echo test >> test.txt 

which "echoing" test test.txt. it's not echoing have typed.

to that, need echo environment variable delbuild, input assigned to.

echo %delbuild% >> test.txt 

also note, once send \n, text committed environment variable , batch file continue run.

this batch file used in testing...

@echo off set /p delbuild=lozors?:  echo %delbuild% >> test.txt 

this code used test with...

import java.io.ioexception; import java.io.inputstream; import java.io.outputstream;  public class testprocessbuilder02 {      public static void main(string[] args) {         try {             processbuilder pb = new processbuilder("test.bat");             pb.redirecterror();             process p = pb.start();              outputstream os = null;             try {                 os = p.getoutputstream();                 os.write("i invincible".getbytes());             } {                 try {                     os.close();                 } catch (exception e) {                 }             }             inputstream = null;             try {                 = p.getinputstream();                 int in = -1;                 while ((in = is.read()) != -1) {                     system.out.print((char)in);                 }             } {                 try {                     is.close();                 } catch (exception e) {                 }             }             int exit = p.waitfor();             system.out.println("exited " + exit);         } catch (exception exp) {             exp.printstacktrace();         }     }  } 

note- i've used processbuilder easier , more forgiving trying use runtime#exec on it's own - imho