JAVA字符串反转
import java.util.Scanner;
public class Demo3 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入字符串：");
String arr = scanner.nextLine();
System.out.println(Tostring(arr));
}
public static String Tostring(String arr){
String s = "";
for(int i = arr.length()-1 ; i>=0 ; i--) {
s+=arr.charAt(i);
}
return s;
}
}
