How to convert a string into a collection of KeyEvents

I'm working on a program that must interact with a 3rd party application (closed to me, I have no access to the code or anything like that). I have been unable to send data to the program by getting its OutputStream. The only thing that has worked was using a Robot object to send individual key events (i.e. robot.keyPress(KeyEvent.VK_A);). Therefore I'm looking to convert a string (many different strings actually) into a collection of their associated KeyEvents so I can send them to the other application. Does anyone know a good way of doing it, or is anyone able to help me with using the OutputStream?
Thank you!
(The 3rd party application is Attachmate InfoConnect, a Unisys terminal emulation program that I have to use to access a mainframe).

Here is a code sample.     public void checknumber(int vsize){
int total;
String anum;
anum = tf2.getText();
validnumber = true;
lines2combine = 1;     //default (an integer)
recs2make = 1;          //default
try{
lines2combine = Integer.parseInt(anum);
catch (NumberFormatException e){
          System.out.println("Entry for lines to combine not numeric");
     validnumber = false;
     d1Title = "Data Entry Error";
     d1Txt = "For number for lines to combine;";
     d2Txt = "Enter a number.";
     doMessage();

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