[Java] getText() vrne prazen niz

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;


public class Primer extends JFrame{

	private String ime;
	Container glavniPanel;
	
	public Okno(){
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setSize(300, 200);
		setVisible(true);
		
		JPanel panel = new JPanel();
		JTextField text = new JTextField();
		JButton potrdi = new JButton("potrdi");
		panel.add(text);
		panel.add(potrdi);
		panel.setLayout(new FlowLayout());
		
		text.setPreferredSize(new Dimension(150,35));
		
		ime = text.getText();
		
		glavniPanel = getContentPane();
		glavniPanel.add(panel);
		
		potrdi.addActionListener(new Listener());
		
		
		
		
	}
	 class Listener implements ActionListener{

	        @Override
	        public void actionPerformed(ActionEvent ae) {
	            System.out.println(ime);
	        }
	        
	    }
	
}

 class Listener implements ActionListener{
		 
		 String ime;
		 public Listener(JTextField text){
			 ime = text.getText();
		 }
	        @Override
	        public void actionPerformed(ActionEvent ae) {
	            System.out.println(ime);
	        }  
	    }