列表迭代器

package package4;

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

public class ListIteratorDemo {
    public static void main(String[] args) {
        //创建集合
        List<String> list =new ArrayList<>();
        //添加元素
        list.add("hello");
        list.add("world");
        list.add("java");
        //通过List集合的listIterator()方法得到
        ListIterator lit =list.listIterator();
        while(lit.hasNext()){
            String s = (String) lit.next();
            System.out.println(s);
        }
        System.out.println("-------------");
        while(lit.hasPrevious()){
            String b = (String) lit.previous();
            System.out.println(b);
        }

        while(lit.hasNext()){
            String s = (String) lit.next();
            if(s.equals("world")){
                lit.add("javase");
            }
        }
        System.out.println(list);
    }
}
//运行结果
hello
world
java
-------------
java
world
hello
[hello, world, javase, java]