java traverse collection

/*

• 1. (List) Write a method reverseList, the function can accept a List, and then arrange the List in reverse order.
     For example:
     List list = new ArrayList();
     list.add("Hello");
     list.add("World");
     list.add("Learn"); //At this time, list is Hello World Learn
     reverseList(list) ;
     //After calling the reverseList method, the list is Learn World Hello

• */

package shiyan;
import java.util.*;
public class sas{
    
    
	public static void main(String[] args){
    
    
		List list = new ArrayList();
		list.add("hello");
		list.add("world");
		list.add("learn"); 
		List list1=list;
		//使用增强for遍历
		for(Object obj:list){
    
    
			System.out.println(obj);
		}
		System.out.println("--------------");
		reverseList(list);
		
	}
	static void reverseList(List list){
    
    
		//使用ListItetator可以实现正序逆序遍历集合
		System.out.println("--------------");
		ListIterator it = list.listIterator();
		while(it.hasNext()){
    
    
			Object obj = it.next();
		}
		
		while(it.hasPrevious()){
    
    
			Object obj = it.previous();
			System.out.println(obj);
		}
	}
}