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Understanding the ‘super()’ Function in Python and Java
Table of Contents
By Invented Reporter | NEW YORK – 2025/06/18 11:43:29
The `super()` function is a built-in function in both Python and Java, but it serves slightly different purposes related to inheritance and object-oriented programming. In both languages, `super()` is used to access methods and properties from a parent or superclass. However, the specific syntax and use cases vary.
Python’s `super()`
In Python, `super()` is primarily used in the context of class inheritance, especially multiple inheritance. It allows a subclass to call methods from its parent class, ensuring proper initialization and avoiding redundant code. The `super()` function returns a proxy object that delegates method calls to a parent or sibling class.
Consider a scenario with multiple inheritance. As explained on Stack Overflow, when using `super()` in Python with multiple inheritance, the method resolution order (MRO) determines the order in which parent classes are searched for the method being called [[1]]. For example, if you have classes `First` and `Second`, and a subclass inherits from both, the MRO dictates whether `First`’s or `Second`’s methods are called first when using `super()`.
“MRO=[First, Second]. Now call to super in init defined in First will continue searching MRO and find init defined in Second…” [[1]]
Java’s `super()`
In Java, `super()` is used within a subclass to call the constructor or a method of its direct superclass.When calling a superclass constructor, `super()` must be the first statement in the subclass constructor. This ensures that the superclass is properly initialized before the subclass adds its specific initialization.
The `super()` keyword is also relevant in the context of Java Generics. The `super` keyword is used with generics to specify an upper bound for the type parameter. For example, `List<T super Suit>` indicates that the list can hold objects of type `Suit` or any of its superclasses [[3]]. This is particularly useful when you need to write into the list, ensuring that the objects you add are compatible with the list’s type.
Frequently Asked Questions
- What is the primary purpose of `super()` in Python?
- In Python, `super()` is used to call methods from parent classes, especially in multiple inheritance scenarios, ensuring proper initialization and avoiding redundant code.
- Why must `super()` be the first statement in a Java subclass constructor?
- When calling a superclass constructor in Java,`super()` must be the first statement to ensure that the superclass is properly initialized before the subclass adds its specific initialization.
- How does Python’s Method Resolution Order (MRO) affect `super()`?
- The MRO determines the order in which parent classes are searched for the method being called when using `super()` in Python with multiple inheritance.
Sources
- Stack Overflow: How does Python’s super () work with multiple inheritance?
- Stack Overflow: Why do this () and super () have to be the first statement in a constructor
- Stack Overflow: What is the difference between ‘super’ and ‘extends’ in java Generics
- Oracle Java Documentation: subclasses and Inheritance
- Python Documentation: Inheritance
- Python Documentation: The Python 2.3 Method Resolution Order
- Real Python: Super() in Python
- GeeksforGeeks: Constructors in Java
- TutorialsPoint: Python Classes
- ACM Digital Library: Object-Oriented Programming with Simula 67
- IEEE Xplore: History of Object-oriented Programming
- Oracle Java Technologies
- Oracle Java Documentation: Using the Keyword super
- GeeksforGeeks: Super Keyword in java
- Consortium for Software Engineering Research (CSER)
- IEEE Transactions on Software engineering
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