Spring and Generic Class Help!!

[hallinan]

Hi I am trying to create a generic class form existing code I have tried to figure it out but with no avail if anyone could help it would be much appreciated I have tried to do it and this is what I have so far

Here is the Class

public class OpAdd<S> implements Operation<S>{
	public OpAdd() {}
	public String getOpsName() {
		return " plus ";
	}
     
	 public S operate(S original) {

             char previousChar ;
             String or = original.toString();
             String org = or.replaceAll("\\s+","");;

             or = or.replaceAll("\\s+","");

             for(int i =0 ; i < or.length() ; i++ ){

                     previousChar = org.charAt(i);
                     or = replaceCharAt(or, i, or.charAt(or.length()-1));
                     or = replaceCharAt(or, or.length()-1, previousChar);
                  }
             return  (S) or;

	}

public static String replaceCharAt(String s, int pos, char c) {
    return s.substring(0, pos) + c + s.substring(pos + 1);
  }
}

Here is the Interface

public interface Operation<S> {
	S operate(S original);
	String getOpsName();
}

Here is the main program

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.JFrame;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class CalculateSpring {

	private Operation ops;
	private ResultWriter wtr;
        private static JPanel p;
        private JButton Run;
        public static JTextField org,encrpty;
        public JLabel blank;

	
	public void setOps(Operation ops) {
	 this.ops = ops;	
	}
	public  void setWriter(ResultWriter wtr) {
	 this.wtr = wtr;
	}
	
	public static void main(String[] args) {
            String[] args2 = {"3001", "3"};
		ApplicationContext context = 
			new ClassPathXmlApplicationContext(
		        "beans.xml");


		BeanFactory factory = (BeanFactory) context;
		CalculateSpring calc = 
			(CalculateSpring) factory.getBean("opsbean");
		
		calc.execute(args2);
	}
	
	

	public void execute(String [] args)  {
            //String[] args2 = {"3001", "3"};
                JFrame frame = new JFrame();

                p = new JPanel();
                Run = new JButton("ENCRYPT");
                org = new JTextField(30);
                encrpty = new JTextField(30);
                blank = new JLabel("                                                                    ");

                 Run.addActionListener( new ActionListener(){
			public void actionPerformed(ActionEvent e) {
				System.out.println("Click!");
                                String op1 = org.getText();
                                String op2 = encrpty.getText();
                                wtr.showResult(ops.operate(op1) + "!");
			}
		});

                 p.add(org);
                
                 p.add(encrpty);
                 p.add(blank);
                 p.add(Run);


                frame.add(p);
                frame.pack();
                frame.setSize(500, 600);
                frame.show();

		
		
	}

}

Any Help would be great thanks a million