1.方法一:直接反转
public static String reverse1(String str)
{
return new StringBuffer(str).reverse().toString();
}
2.方法二
public static String reverse3(String s)
{
char[] array = s.toCharArray();
String reverse = ""; //注意这是空串,不是null
for (int i = array.length - 1; i >= 0; i--)
reverse += array[i];
return reverse;
}
3.方法三
public static String reverse2(String s)
{
int length = s.length();
String reverse = ""; //注意这是空串,不是null
for (int i = 0; i < length; i++)
reverse = s.charAt(i) + reverse;//在字符串前面连接, 而非常见的后面
return reverse;
}