Java 判断一个字符串是否是对称字符串例如"abc"不是对称字符串，"aba"、"abba"、"aaa"、"mnanm"是对称字符串

代码如下：

public static void main(String[] args) {
		
		String str = "1QabcdcbaQ";
		StringBuilder sb = new StringBuilder(str);
		StringBuilder c = sb.reverse();
		boolean flag = true;
		for (int i = 0; i < c.length()/2; i++) {
			if(str.charAt(i)==c.charAt(i)) {
				flag =true;
			}else {
				flag = false;
			}
		}
		if(flag) {
			System.out.println("对称！");
		}else{
			System.out.println("不对称!");
		}
	}