JAVA:实现reverse string反转字符串算法(附完整源码)

package com.thealgorithms.strings;

public class ReverseString {

    public static void main(String[] args) {
        assert reverse("abc123").equals("321cba");
        assert reverse2("abc123").equals("321cba");
    }

    public static String reverse(String str) {
        return new StringBuilder(str).reverse().toString();
    }

    public static String reverse2(String str) {

        if (str == null || str.isEmpty()) {
            return str;
        }

        char[] value = str.toCharArray();
        for (int i = 0, j = str.length() - 1; i < j; i++, j--) {
            char temp = value[i];
            value[i] = value[j];
            value[j] = temp;
        }
        return new String(value);
    }
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29