method handling Unboxing

/**
*
*/
import java.io.*;
import javax.swing.JOptionPane;
import java.net.URI;
import java.util.*;
/**
* @author Manas9
*
*/
public class ClassTemplate1 {
/**
*
*/
public ClassTemplate1() {
// TODO Auto-generated constructor stub
}
public static void main(String[] args)
throws Exception { // TODO Auto-generated method stub]
try {
//AutoBoxing: integer to wrapper
Integer x1 = Process.roller(10);
System.out.println(x1);
Integer x2 = Process.roller(20);
System.out.println(x2);
//
} catch (NumberFormatException exc) {
//Process
}
}
}// end of class template
//
//Processing with ListIterator
class Process
{
public Process() {
System.out.println("Process outer constructor");
}

public static int roller(Integer n1)
{
return n1; // Auto-Unbox at method
}
}