Hierarchical inheritance in Java involves a single parent class being inherited by multiple child classes. To implement it, define a parent class with common properties and methods, then create child classes that extend the parent class. Each child can inherit and override parent methods while adding unique functionality. https://pallavichauhan2525.stck.me/post/566375/How-to-Implement-Hierarchical-Inheritance-in-Java-A-Step-by-Step-Guide