1、(知识篇)泛型Generic

泛型的使用：public class Test {public static void main(String[] args) {DoWork<Person> doWork = new DoWork<>();doWork.doSth(new Person());DoEat<Man> doEat = new DoEat<>();doEat.doSth(new Man());}// 普通类public static class Person {}// 继承上一个普通类public static class Man extends Person {}// 接受泛型的类public static class DoWork<T> {public void doSth(T obj) {}}// 泛型的继承public static class DoEat<T extends Person> {public void doSth(T obj) {}}}