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Java Build a JavaFX Application Build a Pomodoro App The Model

Don't understand the problem with enums

I have solved the problem with the enums, but I fail to understand fully how the logic behind this code works

public enum Brand {
    JVC("JVC"), SONY("Sony"), COBY("Coby"), APPLE("Apple");
    private String mDisplayName;

    Brand(String displayName) {
        mDisplayName = displayName;

    public String getDisplayName() {
        return mDisplayName;

if someone could explain how all this code is interconnected I would really appreciate that