Questions tagged [static-methods]
Methods that neither require an instance of the class nor can they implicitly access the data (or this, self, Me, etc.) of such an instance.
static-methods
2,822
questions
4681
votes
36
answers
1.1m
views
What is the difference between @staticmethod and @classmethod in Python?
What is the difference between a method decorated with @staticmethod and one decorated with @classmethod?
- 147k
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votes
12
answers
1.2m
views
Static methods in Python?
Can I define a static method which I can call directly on the class instance? e.g.,
MyClass.the_static_method()
- 326k
1940
votes
12
answers
848k
views
Meaning of @classmethod and @staticmethod for beginner [duplicate]
What do @classmethod and @staticmethod mean in Python, and how are they different? When should I use them, why should I use them, and how should I use them?
As far as I understand, @classmethod tells ...
user1632861
1103
votes
30
answers
575k
views
What is the equivalent of Java static methods in Kotlin?
There is no static keyword in Kotlin.
What is the best way to represent a static Java method in Kotlin?
- 44.8k
1081
votes
26
answers
1.3m
views
When to use static methods
I am wondering when to use static methods? Say if I have a class with a few getters and setters, a method or two, and I want those methods only to be invokable on an instance object of the class. Does ...
- 13.5k
672
votes
30
answers
346k
views
Why can't static methods be abstract in Java?
The question is in Java why can't I define an abstract static method? for example
abstract class foo {
abstract void bar( ); // <-- this is ok
abstract static void bar2(); //<-- this ...
- 39.4k
584
votes
22
answers
295k
views
Why doesn't Java allow overriding of static methods?
Why is it not possible to override static methods?
If possible, please use an example.
- 46.3k
567
votes
24
answers
439k
views
Why can't I define a static method in a Java interface?
EDIT: As of Java 8, static methods are now allowed in interfaces.
Here's the example:
public interface IXMLizable<T>
{
static T newInstanceFromXML(Element e);
Element toXMLElement();
}
Of ...
- 32.1k
425
votes
9
answers
281k
views
How to call getClass() from a static method in Java?
I have a class that must have some static methods. Inside these static methods I need to call the method getClass() to make the following call:
public static void startMusic() {
URL songPath = ...
- 4,737
422
votes
14
answers
86k
views
Method can be made static, but should it?
ReSharper likes to point out multiple functions per ASP.NET page that could be made static. Does it help me if I do make them static? Should I make them static and move them to a utility class?
- 44.9k
370
votes
10
answers
97k
views
Namespace + functions versus static methods on a class
Let's say I have, or am going to write, a set of related functions. Let's say they're math-related. Organizationally, should I:
Write these functions and put them in my MyMath namespace and refer to ...
- 4,256
256
votes
13
answers
163k
views
Class method differences in Python: bound, unbound and static
What is the difference between the following class methods?
Is it that one is static and the other is not?
class Test(object):
def method_one(self):
print "Called method_one"
def method_two(...
- 3,189
245
votes
10
answers
189k
views
Why does PyCharm propose to change method to static?
The new pycharm release (3.1.3 community edition) proposes to convert the methods that don't work with the current object's state to static.
What is the practical reason for that? Some kind of micro-...
- 253k
229
votes
8
answers
224k
views
Python version <= 3.9: Calling class staticmethod within the class body?
When I attempt to use a static method from within the body of the class, and define the static method using the built-in staticmethod function as a decorator, like this:
class Klass(object):
@...
- 122k
226
votes
20
answers
94k
views
Should private helper methods be static if they can be static
Let's say I have a class designed to be instantiated. I have several private "helper" methods inside the class that do not require access to any of the class members, and operate solely on their ...
- 3,712
224
votes
12
answers
213k
views
Static method in a generic class?
In Java, I'd like to have something as:
class Clazz<T> {
static void doIt(T object) {
// ...
}
}
But I get
Cannot make a static reference to the non-static type T
I don't understand ...
- 14.1k
204
votes
10
answers
74k
views
Static extension methods in Kotlin
How do you define a static extension method in Kotlin? Is this even possible? I currently have an extension method as shown below.
public fun Uber.doMagic(context: Context) {
// ...
}
The above ...
- 19.7k
192
votes
5
answers
73k
views
`staticmethod` and `abc.abstractmethod`: Will it blend?
In my Python app I want to make a method that is both a staticmethod and an abc.abstractmethod. How do I do this?
I tried applying both decorators, but it doesn't work. If I do this:
import abc
class ...
- 87k
189
votes
15
answers
99k
views
Class with single method -- best approach?
Say I have a class that's meant to perform a single function. After performing the function, it can be destroyed. Is there any reason to prefer one of these approaches?
// Initialize arguments in ...
- 51.3k
174
votes
7
answers
171k
views
Static methods - How to call a method from another method?
When I have regular methods for calling another method in a class, I have to do this
class test:
def __init__(self):
pass
def dosomething(self):
print "do something"
...
- 5,047
151
votes
3
answers
83k
views
Performance of static methods vs instance methods
My question is relating to the performance characteristics of static methods vs instance methods and their scalability. Assume for this scenario that all class definitions are in a single assembly and ...
- 5,015
145
votes
9
answers
10k
views
Why is a static method considered a method?
I'm writing an explanation for some code for a course, and have been accidentally using the words method and function interchangeably. I decided to go back over and fix the wording, but ran into a ...
- 45.1k
135
votes
10
answers
77k
views
What is the purpose of static methods? How do I know when to use one? [duplicate]
I ran into unbound method error in python with this code:
import random
class Sample(object):
def drawSample(samplesize, List):
sample = random.sample(List, samplesize)
return ...
- 33k
135
votes
4
answers
186k
views
static methods and variables in Kotlin?
I want to be able to save a class instance to a private/public static variable, but I can't figure out how to do this in Kotlin.
public class Foo {
private static Foo instance;
public Foo() {
...
- 1,914
129
votes
15
answers
48k
views
Is using a lot of static methods a bad thing?
I tend to declare as static all the methods in a class when that class doesn't require to keep track of internal states. For example, if I need to transform A into B and don't rely on some internal ...
- 4,099
120
votes
2
answers
61k
views
Static method behavior in multi-threaded environment in java
class Clstest{
public static String testStaticMethod(String inFileStr) {
// section 0
// section 1
// do something with inFileStr
...
- 9,106
115
votes
8
answers
489k
views
Cannot make a static reference to the non-static method
Building a multi-language application in Java. Getting an error when inserting String value from R.string resource XML file:
public static final String TTT = (String) getText(R.string.TTT);
This is ...
- 1,287
114
votes
10
answers
108k
views
Getting the name of a child class in the parent class (static context)
I'm building an ORM library with reuse and simplicity in mind; everything goes fine except that I got stuck by a stupid inheritance limitation. Please consider the code below:
class BaseModel {
/*...
- 1,295
113
votes
8
answers
84k
views
.NET: Determine the type of “this” class in its static method
In a non-static method I could use this.GetType() and it would return the Type. How can I get the same Type in a static method? Of course, I can't just write typeof(ThisTypeName) because ThisTypeName ...
- 2,564
105
votes
11
answers
258k
views
Difference between Static methods and Instance methods
I was just reading over the text given to me in my textbook and I'm not really sure I understand what it is saying. It's basically telling me that static methods or class methods include the "...
- 1,615
97
votes
7
answers
89k
views
How to ensure thread safety of utility static method?
Is there any general way or rules exits by which we can ensure the thread safety of static methods specifically used in various Utility classes of any applications. Here I want to specifically point ...
- 29.5k
96
votes
8
answers
97k
views
Using $this inside a static function fails
I have this method that I want to use $this in but all I get is: Fatal error: Using $this when not in object context.
How can I get this to work?
public static function userNameAvailibility()
{
...
- 963
93
votes
4
answers
36k
views
Module function vs staticmethod vs classmethod vs no decorators: Which idiom is more pythonic?
I'm a Java developer who's toyed around with Python on and off. I recently stumbled upon this article which mentions common mistakes Java programmers make when they pick up Python. The first one ...
- 2,546
93
votes
3
answers
34k
views
super() and @staticmethod interaction
Is super() not meant to be used with staticmethods?
When I try something like
class First(object):
@staticmethod
def getlist():
return ['first']
class Second(First):
@staticmethod
def ...
- 2,372
87
votes
5
answers
161k
views
Calling static method in python
I have a class Person and a static method in that class called call_person:
class Person:
def call_person():
print "hello person"
In the python console I import the class Person and call ...
- 5,102
87
votes
7
answers
86k
views
Static function declared but not defined in C++
I'm getting an error from the following code using C++.
Main.cpp
#include "file.h"
int main()
{
int k = GetInteger();
return 0;
}
File.h
static int GetInteger();
File.cpp
#include "file.h"...
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85
votes
6
answers
75k
views
How can I dynamically create class methods for a class in python [duplicate]
If I define a little python program as
class a():
def _func(self):
return "asdf"
# Not sure what to resplace __init__ with so that a.func will return asdf
def __init__(...
- 13.1k
79
votes
2
answers
47k
views
static variable link error [duplicate]
I'm writing C++ code on a mac. Why do I get this error when compiling?:
Undefined symbols for architecture i386: "Log::theString",
referenced from:
Log::method(std::string) in libTest.a(...
- 3,450
75
votes
5
answers
19k
views
Why are class static methods inherited but not interface static methods?
I understand that in Java static methods are inherited just like instance methods, with the difference that when they are redeclared, the parent implementations are hidden rather than overridden. Fine,...
- 4,886
72
votes
10
answers
67k
views
When should I use static methods in a class and what are the benefits?
I have concept of static variables but what are the benefits of static methods in a class. I have worked on some projects but I did not make a method static. Whenever I need to call a method of a ...
- 41.9k
70
votes
5
answers
20k
views
Is @staticmethod decorator needed for declaring a Static Method in Python?
I am curious about why we need the @staticmethod decorator to declare method as static.
I was reading about static methods in Python, and I came to know that a static method can be callable without ...
- 1,988
69
votes
2
answers
81k
views
Can we have a static virtual functions? If not, then WHY? [duplicate]
Possible Duplicate:
C++ static virtual members?
Can we have a static virtual functions? If not, then WHY?
class X
{
public:
virtual static void fun(){} // Why we cant have static virtual ...
- 1,877
68
votes
8
answers
10k
views
ReSharper complains when method can be static, but isn't
Why does ReSharper complain when a method can become static, but is not?
Is it because only one instance of a static method is created (on the type) and thus save on performance?
- 107k
68
votes
3
answers
124k
views
TypeScript: Access static methods within classes (the same or another ones)
Suppose we have the following code:
[Test.js file]:
class Test {
...
public static aStaticFunction():void {
...
this.aMemberFunction(); // <- Issue #1.
}
...
- 10.6k
67
votes
2
answers
176k
views
How to verify static void method has been called with power mockito
I am using the following.
Powermock-mockito 1.5.12
Mockito 1.95
junit 4.11
Here is my utils class
public void InternalUtils {
public static void sendEmail(String from, String[] to, String msg, ...
- 3,909
63
votes
7
answers
20k
views
Are static methods more efficient?
In terms of memory and time, is it better to make a method static?
- 24.1k
63
votes
5
answers
60k
views
What is the use of private static member functions?
I was looking at the request parser from the boost::asio example and I was wondering why the private member functions like is_char() are static? :
class request_parser
{
...
private:
static ...
- 6,027
62
votes
1
answer
130k
views
How do I call a static method of another class
I have a class, lets say CAppPath which has a static method:
public:
static CString GetAppPath();
and in CAppPath.cpp it's defined as:
CString CAppPath::GetAppPath()
{
return "C:\..\MypAth"...
- 12.6k
60
votes
2
answers
29k
views
PHP Can static:: replace self::?
I am a little confused with this matter. I am designing an ORM class that tries to behave very similarly to ActiveRecord in ruby on rails, but that's beside the point.
What I'm trying to say is that ...
- 2,184
59
votes
3
answers
94k
views
Can a static method be overridden in C#?
I was told that static methods are implicitly final and therefore can't be overridden. Is that true?
Can someone give a better example of overriding a static method?
If static methods are just ...
- 1,597