How to update a JLabel everytime when JComboBox value changes?

 

package UI;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Practice implements ActionListener{
	
	JFrame frame;
	JComboBox combo;
	JLabel lbl;
	
	public Practice() {
		frame=new JFrame("JComboBox Example");
		frame.setSize(450,450);
		frame.setLocationRelativeTo(null);
		frame.setLayout(null);
		
		String h1[]= {"Window1","Window2"};
		combo=new JComboBox(h1);
		combo.setBounds(10,10,150,25);
		combo.addActionListener(this);
		frame.add(combo);
      
       lbl=new JLabel();
       lbl.setBounds(10,50,100,25);
       frame.add(lbl);
		
		frame.setVisible(true);
		
	}
	public void actionPerformed (ActionEvent ae) {
		if (ae.getSource()==combo) {
			
			String h1=(String) combo.getSelectedItem();
			lbl.setText(h1);
			
		}
	}

	public static void main(String[] args) {
		new Practice();

	}

}