如何从其他类访问变量？

public class MyClass {
    public int myVar;
}

public class AnotherClass {
    public static void main(String[] args) {
        MyClass obj = new MyClass();
        obj.myVar = 10;
        System.out.println(obj.myVar);
    }
}

public class MyClass {
    public static int myVar;
}

public class AnotherClass {
    public static void main(String[] args) {
        MyClass.myVar = 10;
        System.out.println(MyClass.myVar);
    }
}