Execute external shell command in java

To execute an external shell command in java, you can either call the exec method in java.lang.Runtime or create a ProcessBuilder and call its start method.

Call the exec method in java.lang.Runtime

1. Launch the internet explorer
      import java.io.BufferedReader;
      import java.io.InputStreamReader;
      import static java.lang.Compiler.command;

      public class RunShellCommand {
            public static void main(String[] args) {
                  Process p;
                  try {
                         p = Runtime.getRuntime().exec("\"/Program Files/Internet Explorer/iexplore.exe\" http://www.google.com");
                         p.waitFor();
                         p.destroy();
                  } catch (Exception e) {
                        e.printStackTrace();
                  }
            }
      }

2. Get the hostname of your machine
      import java.io.BufferedReader;
      import java.io.InputStreamReader;
      import static java.lang.Compiler.command;

      public class RunShellCommand {
            public static void main(String[] args) {
                  Process p;
                  try {
                        p = Runtime.getRuntime().exec("hostname");
                        p.waitFor();
         
                        BufferedReader reader = new BufferedReader(
                                          new InputStreamReader(
                                          p.getInputStream()));
         
                        StringBuilder result = new StringBuilder();
         
                        String line = "";
                        while ((line = reader.readLine()) != null) {
                              result.append(line + "\n");
                        }
                        System.out.println(result.toString());
                         p.destroy();
                  } catch (Exception e) {
                        e.printStackTrace();
                  }
          }
}

Create a ProcessBuilder and call its start method

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class RunShellCommand {
    public static void main(String[] args) {
        Process p;
        try {
              ProcessBuilder pb = new ProcessBuilder("\"/Program Files/Internet Explorer/iexplore.exe\"", "http://www.google.com/search?q=java");
            p = pb.start();
            p.waitFor();
         
            BufferedReader reader = new BufferedReader(
                    new InputStreamReader(
                            p.getInputStream()));
         
            StringBuilder result = new StringBuilder();
         
            String line = "";
            while ((line = reader.readLine()) != null) {
                result.append(line + "\n");
            }
            System.out.println(result.toString());
            p.destroy();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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