How to use another java program to stop this running prpgram???

Question

Dear Sir:
I have following code and I run it success,
import java.util.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
public class CertainAndRepeatTime{
  public static void main(String[] args) throws IOException{
    int delay = 1;
    Timer timer = new Timer();
    ActionListener actionListener = new ActionListener() {
        public void actionPerformed(ActionEvent actionEvent) {
          System.out.println("Hello World Timer");
    System.out.println("What do you want (Certain time or Repeat time)?");
    System.out.print("Please enter \'C\' or \'R\' for that: ");
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String ans = in.readLine();
    System.out.print("Please enter  ans=" + ans  + " IsTrue=  " + (ans.equals("R") || ans.equals("r")) +"\n");
    if (ans.equals("C") || ans.equals("c")){
      //System.out.println("This line is printed only once start...");
      timer.schedule(new TimerTask(){
        public void run(){
          System.out.println("This line is printed only once.");
      },delay,1);
    else if(ans.equals("r") || ans.equals("R")){
        timer.scheduleAtFixedRate(new TimerTask(){
          public void run(){
            System.out.println("This line is printed repeatedly.");
        },delay, 1000);
      while(true){
           //System.out.println("Charles print This line is printed repeatedly.");          
      } //This will make your main thread hang.
    else{
      System.out.println("Invalid Entry.");
      System.exit(0);
    System.exit(0);
}But I hope to use another java program to stop it when it is running instead of pressing CRTL + C to stop it.
How to do it??
Any example??
Thanks a lot!!

Answer 1

Sorry, I think i did not express cearly. It is my fault.
I re-write my requirements again:
I have
Class AAA1.java,
Class AAA2.java,
Class AAA3.java,
Class AAA20.java...
etc
they all look like the program I posted first time,, once executed, they will run for ever, and they will be stopped until I press CRTL + C;
Now I hope to use another java class StopProgram.java to stop them 1 by 1 or at once instead of pressing CRTL + C;
In this case, how to code this StopProgram.java ??
Thanks