Static method in java

Question

I heard that static methods should use only static variables in java. But, main method is also static, right?

Answer 1

A static method is called on a class instance and not to an object of a class. This means, that a static method is not able to access instance variables, because they are only instantiated in an object.

If you want to access an instance variable with a static method, you have to declare that variable as static.

public class Test {
    private static int value = 0;

    public static void main(String[] args) {
        value++;
    }
}

But to be honest, it's not the best idea to write everything in static methods. It's better to use the main method to instantiate new objects.