300.ArrayList存储字符串和自定义对象并遍历(加泛型)

• ArrayList存储字符串并遍历(泛型) ```java public static void demo1() {

    ArrayList<String> list = new ArrayList<>();            //创建集合对象
    list.add("a");
    list.add("b");
    list.add("c");
    list.add("d");
    Iterator<String> it = list.iterator();
    while(it.hasNext()) {
        System.out.println(it.next());
    }
    /*
    * 输出结果:
    *     a
        b
        c
        d
    * 
    * */

}

```java
    public static void main(String[] args) {
        //demo1();
        ArrayList<Person> list = new ArrayList<>();
        list.add(new Person("david", 23));
        list.add(new Person("sally", 24));
        list.add(new Person("smith", 25));
        list.add(new Person("xm", 26));

        Iterator<Person> it = list.iterator();
        while(it.hasNext()) {
            Person p = it.next();                            //将集合中的每一个元素用Person记录
            System.out.println(p.getName() + "..." + p.getAge());
        }
    }

/*
输出结果:
david...23
sally...24
smith...25
xm...26

*/