/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static String reverse(String str) {
        if(str.isEmpty()) {
            return str;
        }
        else {
            //return reverse(str.substring(1))+str.charAt(0);
            return reverse(str.substring(1))+str.charAt(0);
        }
    }
    public static void main (String[] args) {
        System.out.println(reverse("recurse"));
    }
}

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