简单的字符串反转

import java.util.*;
public class Example7 {
public static void main(String []args){
Scanner in=new Scanner(System.in);
//方法1：用java自带的函数反转
System.out.print("请输入你要反转的内容：");
String a=in.next();
StringBuilder b =new StringBuilder(a);
System.out.println(b.reverse().toString());
//方法2：用char数组反转
char ch[]=a.toCharArray();
int start=0,end=ch.length-1;
char temp;
while(start<end){
temp =ch[start];
ch[start]=ch[end];
ch[end]=temp;
start++;
end--;
}
String c=String.copyValueOf(ch);
System.out.print(c);
}
}