JAVA - JList

An example of JAVA's SWING  JList  .

To display the selected color from list and change the background
I choosed black, coz its my favourite ... lol 

Main class -

import javax.swing.JFrame;


public class Main  extends JFrame{
public static void main(String args[]){
GUI go = new GUI();
go.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
go.setSize(300,200);
go.setVisible(true);
}


}

JList functionality class - 

import java.awt.Color;

import java.awt.FlowLayout;

import javax.swing.JFrame;

import javax.swing.JList;

import javax.swing.JScrollPane;

import javax.swing.ListSelectionModel;

import javax.swing.event.ListSelectionEvent;

import javax.swing.event.ListSelectionListener;

public class GUI extends JFrame {

private JList list;

private static String[] colorNames = {"red", "blue" , "black", "red", "blue" , "black","red", "blue" , "black"};

private static  Color[] colors= {Color.RED ,Color.BLUE ,Color.BLACK, Color.RED ,Color.BLUE ,Color.BLACK ,Color.RED ,Color.BLUE ,Color.BLACK};

//constructor

public GUI(){

super("Title");

setLayout(new FlowLayout());

//initialise  list with color names to select

list = new JList(colorNames);

//set visible row count 

list.setVisibleRowCount(9);

//set the list selection mode

list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

//add the list view 

//JScrollPane  displays the contents of the specified component, 

//where both horizontal and vertical scrollbars

//appear whenever the component's contents are larger than the view

add(new JScrollPane(list));

//add  a listener to the list, to be notified each time a change 

//to the selection occurs; the preferred way of listening for 

//selection state changes.

list.addListSelectionListener(

new ListSelectionListener(){

public void valueChanged(ListSelectionEvent event){

//set backgroud via content pane

// there are three layers of a view - background ,glass , content 

getContentPane().setBackground(colors[list.getSelectedIndex()]);

}

}

);

}

}