What is the definition and benefits of Java polymorphism?

Java polymorphism refers to an object exhibiting different forms or behaviors in different situations, i.e., the same method having different implementations on different objects.

The benefits of Java polymorphism mainly manifest in the following aspects:

1. Enhancing the flexibility and scalability of code: By using polymorphism, more versatile code can be written that can adapt to different objects without the need to write separate code for each object. This can ultimately reduce the amount of code modification required when the program needs to be expanded or altered, thus improving code reusability and maintainability.
2. Streamlining code implementation: Polymorphism allows for more concise code, reducing the need for numerous if-else or switch statements. By defining interfaces or abstract classes, a group of similar objects can be handled uniformly, decreasing code redundancy.
3. By utilizing polymorphism, one can better visualize the logical relationships and behavior of code, thereby enhancing its readability and comprehensibility.
4. Easy to expand and maintain: When new features need to be added, simply adding new implementation classes and implementing the corresponding interface or inheriting the corresponding abstract class is sufficient, without the need to modify existing code.

In conclusion, Java polymorphism allows for different objects to exhibit the same behavior by providing a unified interface or abstract class, enhancing the flexibility, scalability, reusability, and maintainability of the code, resulting in cleaner, more readable, and easily understandable code.