How to get data from Global class to JComboBox in Java Swing?

 

Global Class

 
package Libs;

/**
 *
 * @author Hancie Phago
 */

public class Global2 {
	public static final String ROOM_TYPES[]= {"Single","Double","Deluxe"};	
	public static final double ROOM_PRICE[]= {1000,2000,3000};
  
}

GUI

package Trial;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import com.toedter.calendar.JDateChooser;

import Libs.Global;
import Libs.Global2;
import regularExpression.RegexExpression;

public class Demo {

	JTextField ratetxt;
	JComboBox typecombo;
	JDateChooser DOBtxt;
	JButton register;

	public Demo() {

		JFrame frame = new JFrame("Hancie e-Learning Studio");
		frame.setSize(550, 400);
		frame.setLayout(new BorderLayout());
		
		JPanel main = new JPanel();
		main.setLayout(null);		
		frame.add(main,BorderLayout.CENTER);
		
		typecombo = new JComboBox();
		for (int i = 0; i < Global2.ROOM_TYPES.length; i++) {
			typecombo.addItem(Global2.ROOM_TYPES[i]);
		}
		typecombo.setFont(new Font("Tahoma", Font.PLAIN, 17));
		typecombo.setBounds(130, 150, 220, 35);
		main.add(typecombo);
		

		frame.setVisible(true);
		
	}
	public static void main(String[] args) {
		new Demo();

	}

} 

Output