What is the static keyword in Java?

A static member belongs to the class. You use it with the class name and no object is needed.

• Static field: one copy shared by all the objects (like a counter).
• Static method: can not use this or instance fields (main is static).
• Static block: runs once when the class is loaded.
• Static nested class: a class inside a class, without a link to the outer object.

class Counter {
    static int total = 0;
    Counter() { total++; }
}

public class Main {
    public static void main(String[] args) {
        new Counter();
        new Counter();
        System.out.println(Counter.total);
    }
}

See Java static and this.

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