版权声明：学习分享，共同进步 https://blog.csdn.net/Andrew_jdw/article/details/83090022
public class Demo5 {
public static void main(String[] args) {
String src = "abcdef";
System.out.println(src);
System.out.println(reaverseString(src));
}
public static String reaverseString(String src) {
char[] arr = src.toCharArray();
char[] newArr = new char[arr.length];
int index = arr.length-1;
for (int i = 0; i < arr.length; i++) {
char temp = arr[i];
newArr[index--] = temp;
}
return new String(newArr);
}
}