package swing.comboexample;
 
import java.util.logging.Logger;
 
import javax.swing.Action;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import java.awt.FlowLayout;
import java.awt.Color;
 
import java.awt.event.ActionEvent;
import java.beans.PropertyChangeListener;
 
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.text.AttributeSet.ColorAttribute;
public class HelloWorld extends JFrame{
 
    public static void main(String... args) {
			HelloWorld helloWorld = new HelloWorld();
			helloWorld.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			JComboBox<String> cboColor = new JComboBox<String>();
			cboColor.addItem("rojo");
			cboColor.addItem("verde");
			cboColor.addItem("azul");
			JLabel lblPrincipal = new JLabel("hola");
			lblPrincipal.setOpaque(true);
			cboColor.addActionListener(p->{
				int index = cboColor.getSelectedIndex();
 
				switch (index) {
				case 1:
					lblPrincipal.setBackground(Color.RED);
					break;
				case 2:
					lblPrincipal.setBackground(Color.GREEN  );
					break;
 
				case 3:
					lblPrincipal.setBackground(Color.BLUE);
					break;
 
				}
			} );
			helloWorld.getContentPane().setLayout( new FlowLayout() );
			helloWorld.getContentPane().add(cboColor);
 
			helloWorld.getContentPane().add(lblPrincipal);
			helloWorld.setLocationRelativeTo(null);
			helloWorld.pack();
			helloWorld.setVisible(true);
	}
 
 
}