java 反取字符串

public class demo2 {

    /**
     * 2 : 将字符串反取出来     新中国好  好国中新
     */
    public static void main(String[] args) {

        String s = "新中国好";

        s = reverse1(s);
        System.out.println("方法一：" + s);

        s = reverse2(s);
        System.out.println("方法二：" + s);

        s = reverse3(s);
        System.out.println("方法三：" + s);

    }
    public static String reverse1(String s) {
        int len = s.length();
        if (len <= 1) {
            return s;
        }
        String left = s.substring(0, len / 2);
        String right = s.substring(len / 2, len);
        return reverse1(right) + reverse1(left);
    }
    public static String reverse2(String s) {
        char[] array = s.toCharArray();
        String reverse = "";
        for (int i = array.length - 1; i >= 0; i--) {
            reverse += array[i];
        }
        return reverse;
    }
    public static String reverse3(String s) {

        return new StringBuffer(s).reverse().toString();
    }  

}