Static Attributes (python Vs Java)

What is the difference between Python class attributes and Java static attributes? For example, in Python class Example: attribute = 3 in Java public class Example { priv

Solution 1:

In Python, you can have a class variable and an instance variable of the same name [Static class variables in Python]:

>>>classMyClass:...    i = 3...>>>MyClass.i
3 

>>>m = MyClass()>>>m.i = 4>>>MyClass.i, m.i>>>(3, 4)

In Java, you cannot have a static and non-static field with the same name (the following will not compile, you get the error "Duplicate field MyClass.i"):

publicclassMyClass {
  privatestaticint i;
  privateint i;
}

additionally, if you try to assign a static field from an instance, it will change the static field:

publicclassMyClass {
  privatestaticint i = 3;

  publicstaticvoidmain(String[] args) {
    MyClass m = new MyClass();
    m.i = 4;

    System.out.println(MyClass.i + ", " + m.i);
  }
}

4, 4

---

In both Java and Python you can access a static variable from an instance, but you don't need to:

Python:

>>>m = MyClass()>>>m.i
3
>>>MyClass.i
3

Java:

publicstaticvoidmain(String[] args) {
    System.out.println(new MyClass().i);
    System.out.println(MyClass.i);
  }

3 3