Define the static member : static Member « Class Definition « Java Tutorial

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2. Class Definition
3. static Member

1. You can use the keyword static in front of a field or method declaration.
2. The static keyword may come before or after the access modifier.

These two are correct:

public static int a;
static public int b;

To define a static method in the MathUtil class:

public class MathUtil {
    public static int add(int a, int b) {
        return a + b;
    }
}

1. From inside a static method, you cannot call instance methods or instance fields because they only exist after you create an object.
2. You can access other static methods or fields from a static method.
3. You can only declare a static variable in a class level.
4. You cannot declare local static variables even if the method is static.