How to work with enum in Java?

Question

Java

Reached the topic about transfers. And immediately from the first example some troubles.
An example is given.

enum Apple {
    Apple1, Apple2, Apple3, Apple4, Apple5
}

public class App {
    public static void main(String[] args) {
        Apple apple;
        apple = Apple.Apple3;

        System.out.println("Значение apple: " + apple);
        System.out.println();

        apple = Apple.Apple2;

        if (apple == Apple.Apple2) {
            System.out.println("Переменная apple содержит Apple2.\n");
        }

        switch(apple) {
            case Apple1:
                System.out.println("Сорт " + apple);
                break;
            case Apple2:
                System.out.println("Сорт " + apple);
                break;
            case Apple3:
                System.out.println("Сорт " + apple);
                break;
            case Apple4:
                System.out.println("Сорт " + apple);
                break;
            case Apple5:
                System.out.println("Сорт " + apple);
                break;
        }
    }
}

In what part of the code should I write this enum*?
I watched a video on enum, where enum is stored in a separate file, as a class or interface.
Wherever I have not tried to write this enum, there are errors everywhere.
Googled the text of the log, but did not really find anything.
This Java is hellishly difficult...
Examples of errors.

Error:(1, 1) java: enums are not supported in -source 1.3
  (use -source 5 or higher to enable enums)

Warning:(3, 12) java: as of release 5, 'enum' is a keyword, and may not be used as an identifier
  (use -source 5 or higher to use 'enum' as a keyword)

Answer.
Set value from 5.

Answer 1

java version error. use Java 5 or higher