import javax.swing.*;

import java.awt.event.*;

public class JavaLesson25 extends JFrame{

JButton button1;

String infoOnComponent = "";

JList favoriteMovies, favoriteColors;

DefaultListModel defListModel = new DefaultListModel();

JScrollPane scroller;

public static void main(String[] args){

new JavaLesson25();

}

public JavaLesson25(){

this.setSize(400,400);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setTitle("My Fifth Frame");

JPanel thePanel = new JPanel();

// Create a button

button1 = new JButton("Get Answer");

ListenForButton lForButton = new ListenForButton();

button1.addActionListener(lForButton);

thePanel.add(button1);

String[] movies = {"Matrix", "Minority Report", "Big"};

// Creating a List Box

favoriteMovies = new JList(movies);

// Define the height of each cell

favoriteMovies.setFixedCellHeight(30);

// Define the width of each cell

favoriteMovies.setFixedCellWidth(150);

// Define how many selections can be made

// MULTIPLE_INTERVAL_SELECTION: Select what ever you want

// SINGLE_SELECTION: Select only one

// SINGLE_INTERVAL_SELECTION: Select as many as you want if in order

favoriteMovies.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);

// All the methods for lists

/*

* getSelectedIndex(): returns the index for the first selected item

* getSelectedIndexes(): returns every selection in a list

* getSelectedValue(): returns the value of the first selected

* getSelectedValues(): returns an array of all values

* isSelectedIndex(): returns true if index is selected

*/

// You can't change items in a list unless you store the items

// in a DefaultListModel

String[] colors = {"Black", "Blue", "White", "Green", "Orange", "Gray", "Pink"};

// How to load a String array into a DefaultListModel

for(String color: colors){

defListModel.addElement(color);

}

// Add item named Purple to index number 2

defListModel.add(2, "Purple");

// Create a List box filled with items in the DefaultListModel

favoriteColors = new JList(defListModel);

// Only display 4 items at a time

favoriteColors.setVisibleRowCount(4);

// Create a scroll bar panel to hold the list box

scroller = new JScrollPane(favoriteColors,

JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,

JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

// Define the height of each cell

favoriteColors.setFixedCellHeight(30);

// Define the width of each cell

favoriteColors.setFixedCellWidth(150);

thePanel.add(favoriteMovies);

// You add the scroll bar container, not the list

thePanel.add(scroller);

this.add(thePanel);

this.setVisible(true);

}

private class ListenForButton implements ActionListener{

public void actionPerformed(ActionEvent e){

if(e.getSource() == button1){

// contains returns true if the item is in the list

if(defListModel.contains("Black")) infoOnComponent += "Black is here\n";

// Check if the list isn't empty

if(!defListModel.isEmpty()) infoOnComponent += "Isn't Empty\n";

// return the number of items in the DefaultListModel

infoOnComponent += "Elements in the list " + defListModel.size() + "\n";

// return the first element in the list

infoOnComponent += "Last Element " + defListModel.firstElement() + "\n";

// return the last element in the list

infoOnComponent += "Last Element " + defListModel.lastElement() + "\n";

// return the last element in the list

infoOnComponent += "Element in index 1 " + defListModel.get(1) + "\n";

// Remove the item in index 0

defListModel.remove(0);

// Remove the item named Big

defListModel.removeElement("Blue");

// Create an array filled with the list items

Object[] arrayOfList = defListModel.toArray();

// Iterate through the array

for(Object color: arrayOfList){

infoOnComponent += color + "\n";

}

JOptionPane.showMessageDialog(JavaLesson25.this, infoOnComponent, "Information", JOptionPane.INFORMATION_MESSAGE);

infoOnComponent = "";

}

}

}

}