Java by API/java.lang/Process

Process: exitValue()

 
/*
 * Output:
 * 
notepad returned 0
 * 
 *  
 */
public class MainClass {
  public static void main(String args[]) {
  Runtime r = Runtime.getRuntime();
  Process p = null;
  String cmd[] = { "notepad", "/java/src/java/lang/Runtime.java" };
  try {
      p = r.exec(cmd);
      p.waitFor();
  } catch (Exception e) {
      System.out.println("error executing " + cmd[0]);
  }
  System.out.println(cmd[0] + " returned " + p.exitValue());
  }
}

Process: getInputStream()

 
import java.io.BufferedReader;
import java.io.InputStreamReader;
/*
 */
public class MainClass {
  public static void main(String[] args) throws Exception{
    Runtime r = Runtime.getRuntime();
    String[] nargs = { "sh", "-c", "for i in 1 2 3; do echo $i; done" };
    Process p = r.exec(nargs);
    BufferedReader is = new BufferedReader(new InputStreamReader(p.getInputStream()));
    String line;
    while ((line = is.readLine()) != null)
      System.out.println(line);
  }
}

Process: getOutputStream()

  
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();
  }
}

Process: waitFor()

 
/*
 * Output:
 * 
notepad returned 0
 * 
 *  
 */
public class MainClass {
  public static void main(String args[]) {
  Runtime r = Runtime.getRuntime();
  Process p = null;
  String cmd[] = { "notepad", "/java/src/java/lang/Runtime.java" };
  try {
      p = r.exec(cmd);
      p.waitFor();
  } catch (Exception e) {
      System.out.println("error executing " + cmd[0]);
  }
  System.out.println(cmd[0] + " returned " + p.exitValue());
  }
}