泛型的理解

泛型的理解

public class Animal<T> {
    private T t;
}

import java.util.ArrayList;
import java.util.List;

public class XXXXTESTX<T, E> {
    private List<Animal<?>> postProcessors = new ArrayList<>();
    private List<Animal<E>> postProcessorsE = new ArrayList<>();

    public void use_postProcessors() {
        Animal<String> stringAnimal = new Animal<>();
        Animal<Integer> integerAnimal = new Animal<>();
        postProcessors.add(stringAnimal);
        postProcessors.add(integerAnimal);
    }

    public void use_postProcessorsE() {
        Animal<String> stringAnimal = new Animal<>();
        postProcessorsE.add(stringAnimal);
    }
}