how to generate random strings?

here is a piece of code that I am working with, however, I want to generate random responses with regards to the strings that I have set up. How best to approach this?

  public void run() {
  String importantInfo[] = {
          "Hello",
          "Good day",
          "bye",
          "farewell"
  };
  Random random = new Random();

  for (int i = 0;
       i < importantInfo.length;
       i++) {
     drop.put(importantInfo[i]);
     try {
        Thread.sleep(random.nextInt(5000));
     } catch (InterruptedException e) {}
     }
     drop.put("DONE");
      }