import java.util.*;
public class 一 {
    public static void main(String[] args) {
        ArrayList list = new ArrayList<>();
        list.add("张三 ");
        list.add("李四 ");
        list.add("王五 ");
        list.add("赵六 ");
        Iterator it = list.iterator();
        while(it.hasNext()){
            Object obj = it.next();
            System.out.println(obj);

        }
    }
}

运行结果、