Reversor.java

public class Reversor{
public static void main(String[] args){
String t = reverse("Hello World");
System.out.println(t);
}

public static String reverse(String s){
int length = s.length();
int last = length - 1;
char[] cArray = s.toCharArray();
for(int i=0;i<length/2;i++){
char c = cArray[i];
cArray[i] = cArray[last-i];
cArray[last-i] = c;
}
return new String(cArray);
}
}