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Understanding the ‘super()’ Function in Python and Java

Understanding the ‘super()’ Function in Python and Java

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

About the Author

Invented Reporter is a technology enthusiast and writer with a passion for explaining complex programming concepts in a clear and accessible manner.


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