Execuate a system command

Process exec(String command): Executes the specified string command in a separate process.
Process exec(String[] cmdarray): Executes the specified command and arguments in a separate process.
Process exec(String[] cmdarray, String[] envp): Executes the specified command and arguments in a separate process with the specified environment.
Process exec(String[] cmdarray, String[] envp, File dir): Executes the specified command and arguments in a separate process with the specified environment and working directory.
Process exec(String command, String[] envp): Executes the specified string command in a separate process with the specified environment.
Process exec(String command, String[] envp, File dir): Executes the specified string command in a separate process with the specified environment and working directory.


import java.io.IOException;

public class Main {
  public static void main(String[] args) {
    Runtime runtime = Runtime.getRuntime();

    try {
      Process pro = runtime.exec("notepad.exe");
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

Wait until notepad is terminated.

 
public class Main {
  public static void main(String args[]) {
    Runtime r = Runtime.getRuntime();
    Process p = null;
    try {
      p = r.exec("notepad");
      p.waitFor();
    } catch (Exception e) {
      System.out.println("Error executing notepad.");
    }
    System.out.println("Notepad returned " + p.exitValue());
  }
}

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