Java泛型杂谈

public class Test {
    public static void main(String[] args) throws InterruptedException {

        List list1 = new ArrayList();
        foo(list1);
        bar(list1);

        List list2 = new ArrayList<>();
        foo(list2);
        bar(list2);

        List list3 = new ArrayList<>();
        foo(list3);
        bar(list3);

        List