Send an Input to a Command : Runtime System « Development « Java Tutorial

1. Java Tutorial
2. Development
3. Runtime System

import java.io.OutputStream;

public class Main {
  public static void main(String[] argv) throws Exception {
    String command = "cat";
    Process child = Runtime.getRuntime().exec(command);
    OutputStream out = child.getOutputStream();
    out.write("some text".getBytes());
    out.close();
  }
}