在字符串尾部加入最少字符使字符串成为回文字符串

java代码：

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);			
		String s = in.nextLine();			
		StringBuffer sb1 = new StringBuffer(s);		
		for (int i = 0; i < s.length()-1 && !isTrue(sb1.toString()); i++) {
			sb1.insert(s.length(), s.charAt(i));
		}		
		System.out.println(sb1); // 输出得到的最短字符串
		
	}

	public static boolean isTrue(String s) {  //判断是否回文
		boolean flag = true;
		for (int i = 0; i <= s.length() / 2; i++) {
			if (s.charAt(i) != s.charAt(s.length() - i - 1)) {
				flag = false;
				break;
			}
		}
		return flag;
	}
}