gistfile1.java

        PipedOutputStream poStream = new PipedOutputStream();
        PipedInputStream piStream = new PipedInputStream();
        System.setIn(piStream);

        poStream.connect(piStream);
        poStream.write("19".getBytes(), 0, 1);

        Program.main();

Program

public class Program {

    public static void main(String... args) {
       while(true) {
            InputStreamReader inputStream = new InputStreamReader(System.in);
            BufferedReader reader = new BufferedReader(inputStream);
            int i1 = 0;
            try {
                i1 = Integer.parseInt(reader.readLine());
            } catch (Exception e) {
                // Do you know what numbers are!!!
                System.out.println("Enter a valid integer!!");

            }
        
        // code further down does stuff with i1
  
        }
    }
}

I want to get 2 different values when reader.readLine() gets called. 

The first time the value it reads would be "1" and the second time it should be "9"