Java chatbot throws an error that I couldn't resolve myself

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I am learning Java myself and I got a "working" code from a Youtube video:

<pre lang="Java">import java.util.Scanner;

public class chatbot {
    
    public static void main(String[] args){
        System.out.println("\f");
        Scanner sc = new Scanner(System.in);
        System.out.println("Hello lets chat | what is your name?");
        System.out.println(">>>");
        String n = sc.nextLine();
        System.out.println("Ok " + n + " How are you?");

        while(true) {
          System.out.println(">>>");
          String s = sc.nextLine();
          s = s.toUpperCase();

          if(s.indexOf("FINE") >= 0) {
            System.out.println("GOOD TO KNOW " + n);
          }

          else if(s.indexOf("HI") >= 0) {
              System.out.println("Hi " + n); 
          }
          else if(s.indexOf("WEATHER") >= 0) {
              System.out.println("I HAVEN'T CHECKED");
          }
          else if(s.indexOf("NAME") >= 0) {
              System.out.println(n + "'s"+" Chatbot");
          }
          else {
              final int num = 3;
              double r = Math.random();
              int whichResponse = (int) (r * num);
              String response ="";

              if(whichResponse == 0) {
                  response = "Hmmm. ";
              }
              else if(whichResponse == 1){
                  response = "Ok...";
              }
              else if(whichResponse == 2){
                  response = "I am not programmed to respond";
              }
              else if(whichResponse == 3){
                  response = "I do not know";
              }
              System.out.println(response);
          }
        }
    }
}

What I have tried:

this code gives me the following error:

java chatbot
Error: Could not find or load main class chatbot
Caused by: java.lang.ClassNotFoundException: chatbot

javac chatbot.java
chatbot.java:28: error: cannot find symbol
          else if(s.indexOf("NAME") >= 0) {
                   ^
  symbol:   method indexOf(String)
  location: variable s of type String

I made sure that everything is in place, but appreciate any suggestions to fix this.

Posted 13-Apr-21 2:07am

Member 15125407

Updated 13-Apr-21 2:17am

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CPallini · Accepted Answer · 2021-04-13T02:17:00

Solution 1

What version of Java are you using?
Your code compiles and runs fine on my Linux box

javac chatbot.java 
java chatbot

Hello lets chat | what is your name?
>>>
Foo
Ok Foo How are you?
>>>
fine
GOOD TO KNOW Foo
>>>
^C

Java versions:

openjdk 11.0.10 2021-01-19
OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode, sharing)

Posted 13-Apr-21 2:17am

CPallini

Comments

[no name] 14-Apr-21 4:06am

Thank you for checking and great to know the codes are working! I am pretty new to Java but i think the version is /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home"

I think the problem is the code editor I am using (VSCode). As your Linux fires my codes without inches, I think I messed up initial configurations to set up Java environment with the VSCode.