Code used in "Enums in Apex | What is Enum and where do we use it? | Salesforce Apex Tutorial Series by SFDC Stop" tutorial on SFDC Stop (https://youtu.be/N3du8bRbYSs)

enum.cls

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Enums in Apex
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An enum is an abstract data type whose values consist of a finite set of identifiers.
Enums are typically used to define a set of possible values that don’t otherwise have a numerical order.

public enum Color { RED, BLUE, GREEN, ORANGE, PURPLE }

values()
---------
public enum Color { RED, BLUE, GREEN, ORANGE, PURPLE }
List<Color> colorEnums = Color.values();
System.debug(colorEnums);

ordinal()
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public enum Color { RED, BLUE, GREEN, ORANGE, PURPLE }
System.debug(Color.BLUE.ordinal());
System.debug(Color.PURPLE.ordinal());

name()
--------
public enum Color { RED, BLUE, GREEN, ORANGE, PURPLE }
System.debug('BLUE'.equals(Color.BLUE.name()));

valueOf()
--------
public enum Color { RED, BLUE, GREEN, ORANGE, PURPLE }
Color blueColor = Color.valueOf('blue1');
System.debug(blueColor);

System.debug('Logging Levels: ' + LoggingLevel.values());
System.debug('Status Codes: ' + StatusCode.values());

primary Student - 0
secondary Student - 1
senior secondary student - 2

0, 1, 2


Student student1 = new Student(1, 'Richard', Student.Category.SECONDARY);
System.debug(student1.getCategory());
System.debug(student1.getCategoryAsString());

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                          Student Class
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public class Student {

    public enum Category { PRIMARY, SECONDARY, SENIOR_SECONDARY }
    Integer id;
    String name;
    Category studentCategory;

    public Student(Integer id, String name, Category studentCategory) {
        this.id = id;
        this.name = name;
        this.studentCategory = studentCategory;
    }

    public Category getCategory() {
        return studentCategory;
    }

    public String getCategoryAsString() {
        return studentCategory.name();
    }
}