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Why and When Should You Call `super()` in a Java Constructor?

Mary-Kate Olsen
Mary-Kate OlsenOriginal
2024-10-26 01:54:03360browse

Why and When Should You Call `super()` in a Java Constructor?

The Significance of Calling super() in a Constructor

In Java, when extending a parent class, it's not uncommon to encounter a call to super() within the constructor of the child class. While it's possible to access methods of the parent class without explicitly calling super(), understanding its purpose is crucial.

Purpose of super()

The super() method serves two primary purposes:

  1. Invoking the Parent Class Constructor: If the parent class constructor takes parameters, calling super() with arguments allows you to specify those parameters. This is necessary if the parent class doesn't provide a default parameter-less constructor.
  2. Providing Arguments: Even if the parent class has a default constructor, calling super() with arguments gives you finer control over the parent class's initialization. You can modify the values that are passed to the parent class's constructor.

Implicit Call to super()

Java implicitly calls the default constructor of the parent class (i.e., super()) for every user-defined class that inherits from a parent class. So, calling super() explicitly is usually not required.

**Example: Customizing JFrame

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