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  1. import java.io.*;
  2. import java.util.HashMap;
  3. import java.util.Map;
  4.  
  5. interface Command {
  6.     void execute() throws Exception;
  7. }
  8.  
  9. class RuntimeExecCommand implements Command {
  10.     private final String command;
  11.  
  12.     public RuntimeExecCommand(String command) {
  13.         this.command = command;
  14.     }
  15.  
  16.     @Override
  17.     public void execute() throws Exception {
  18.         Runtime.getRuntime().exec(command);
  19.     }
  20. }
  21.  
  22. class PrintCommand implements Command {
  23.     private final String printString;
  24.  
  25.     public PrintCommand(String printString) {
  26.         this.printString = printString;
  27.     }
  28.  
  29.     @Override
  30.     public void execute() throws Exception {
  31.         System.out.println(printString);
  32.     }
  33. }
  34.  
  35. class Jarvis {
  36.  
  37.     private static final Map<String, Command> COMMANDS = new HashMap<String, Command>();
  38.     static {
  39.         COMMANDS.put("jarvis you there?", new PrintCommand("at your service sir"));
  40.         COMMANDS.put("run command prompt", new RuntimeExecCommand("cmd.exe /c start"));
  41.         COMMANDS.put("run notepad", new RuntimeExecCommand("notepad.exe"));
  42.         // ...
  43.     }
  44.  
  45.     public static void main(String args[]) throws IOException {
  46.         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  47.         for (;;) {
  48.             System.out.println("Command me: ");
  49.             String line = br.readLine();
  50.             if (line == null || line.isEmpty())
  51.                 break;
  52.             Command command = COMMANDS.get(line);
  53.             if (command != null) {
  54.                 try {
  55.                     command.execute();
  56.                 } catch (Exception e) {
  57.                     System.out.println("Failed to execute command because of:" + e);
  58.                 }
  59.             } else {
  60.                 System.out.println("Unknown Command.");
  61.             }
  62.         }
  63.         System.out.println("Goodbye.");
  64.     }
  65. }
  66.  
Success #stdin #stdout 0.08s 380224KB
comments ()
stdin
copy 
jarvis you there?
run notepad
stdout
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Command me: 
at your service sir
Command me: 
Failed to execute command because of:java.io.IOException: Cannot run program "notepad.exe": error=2, No such file or directory
Command me: 
Goodbye.
https://ideone.com/d6pf7T
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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