Java中把一个字符串实现反转【杭州多测师_王sir】【杭州多测师】

Java中把一个字符串实现反转 

    /**
     * 使用StringBuilder的reverse()方法将字符串反转
     */
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder("ABCDE牛");
        System.out.println(sb.reverse());
    }

    public static String reverseTestThree(String s) {
        StringBuffer sb = new StringBuffer();
        for (int i = s.length() - 1; i >= 0; i--) {
            sb.append(s.charAt(i));
        }
        return sb.toString();
    }

    public static String reverseTestSix(String s) {
        if (s.length() <= 1) {
            return s;
        }
        return reverseTestSix(s.substring(1)) + s.substring(0, 1);
    }