Singleton Pattern

Analogy: pattern

The Singleton Pattern is like a King.

A Kingdom can only have ONE King. If you ask for the King, you get the same person every time. You don't get a new King cloned for every request.

The King

Try to create multiple Kings.

The first time, a King is born (Created).
Every subsequent time, the SAME King is returned.

The King (Singleton Pattern)

Rule of the Kingdom

"There can be only ONE King!"

Empty Throne

// System Log waiting...

The Code

Make the constructor private and provide a static method to get the instance.

Java Example

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class King {
    private static King instance;

    // Private Constructor
    private King() {}

    public static King getInstance() {
        if (instance == null) {
            instance = new King();
        }
        return instance;
    }
}