Java Inheritance Syntax: How Subclasses Inherit from Parent Classes and Understanding the Inheritance Relationship Simply

This article explains Java inheritance, with the core being subclasses reusing parent class attributes and methods while extending them, implemented via the `extends` keyword. The parent class defines common characteristics (attributes/methods), and subclasses can add unique functionalities after inheritance, satisfying the "is - a" relationship (the subclass is a type of the parent class). Subclasses can inherit non - `private` attributes/methods from the parent class; `private` members need to be accessed through the parent class's `public` methods. Subclasses can override the parent class's methods (keeping the signature unchanged) and use `super` to call the parent class's members or constructors (with `super()` in the constructor needing to be placed on the first line). The advantages of inheritance include code reuse, strong scalability, and clear structure. Attention should be paid to the single inheritance restriction, the access rules for `private` members, and the method overriding rules.