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) {

}

}

}