如输入 abcdefg
输出 gfedcba
import java.util.LinkedList; public class Linked { public static void main(String[] args) { String str = "abcdefg"; LinkedList<Character> list = new LinkedList<Character>(); for (int i = 0; i < str.length(); i++) { char c = str.charAt(i); list.addFirst(c); } String newstr = ""; while(list.size() > 0) { newstr += list.removeFirst(); } System.out.println(newstr); } }