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Java's polymorphism is a feature of object-oriented programming that allows different objects to be accessed and manipulated in a uniform way. It enables an instance of a class to exhibit multiple forms at runtime. Polymorphism in Java relies on two basic concepts: inheritance and method overriding. In Java, a subclass can inherit methods from ...

In Java, the HashMap implementation uses the hashCode() method to determine the storage bucket for a key and the equals() method to check for key equality. The default implementation in the Object class generates a hash code based on the object's memory address. This behavior creates a problem when using custom objects as keys: two distinct ins ...