Java实现字符串反转

将一个字符串进行反转

https://www.cnblogs.com/binye-typing/p/9260994.html

package com.interview.algorithm;

public class StringReverse {
    // StringBuffer
    public static String reverse1(String str) {
        return new StringBuilder(str).reverse().toString();
    }
    // toCharArray 逆向
    public static String reverse2(String str) {
        char[] chars = str.toCharArray();
        String reverse = "";
        for (int i = chars.length - 1; i >= 0; i--) {
            reverse += chars[i];
        }
        return reverse;
    }
    // charAt  正向
    public static String reverse3(String str) {
        String reverse = "";
        int length = str.length();
        for (int i = 0; i < length; i++) {
            reverse = str.charAt(i) + reverse;
        }
        return reverse;
    }
    public static void main(String[] args) {
        String s = "cf_wu";
        System.out.println(reverse1(s));
        System.out.println(reverse2(s));
        System.out.println(reverse3(s));

    }
}