randomLine.java

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;   

   private String getRandomLine(String path){
      List<String> lines;
      try{
         lines = Files.readAllLines(Paths.get(path));
      }
      catch(IOException e) {
         e.printStackTrace();
         return "[ERROR]";
      }
      
      return lines.get((int)(Math.random() * lines.size()));
   }