代码：
from sklearn.datasets import load_iris, fetch_20newsgroups
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.model_selection import train_test_split, GridSearchCV
from sklearn.naive_bayes import MultinomialNB
from s…
优势： 代码：
public class test {public static void main(String[] args) {Animal a new Dog();a.eat(); }
}
class Animal{public void eat(){System.out.println("动物再吃东西");}
}
class Dog extends Animal{Overridepublic void eat(…
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