掌握LinkedList的特殊方法，用LinkedList實現字符串反轉輸出

如輸入 abcdefg

輸出 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);
		
	}
}