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ID: 2247867 • Letter: #

Question

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/* Practice using layouts
Anderson, Franceschi
*/

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class NestedLayoutPractice extends JFrame
{
private Container contents;
private Game game;

private BorderLayout bl;

private JLabel bottom;

// Part 1 student code ends here.

public NestedLayoutPractice()
{
super("Practicing layout managers");
contents = getContentPane();

// ***** Task 2:
// instantiate the BorderLayout manager bl
// Part 2 student code starts here:

// set the layout manager of the content pane contents to bl:

game = new Game(3); // instantiating the GamePanel object

// add panel (game) to the center of the content pane

// Part 2 student code ends here.

bottom = new JLabel("Have fun playing this Tile Puzzle game",
SwingConstants.CENTER);

// ***** Task 3:
// instantiate the JPanel component named top
// Part 3 student code starts here:

// set the layout of top to a 1-by-3 grid

// instantiate the JButtons that determine the grid size

// add the buttons to JPanel top

// add JPanel top to the content pane as its north component

// Part 3 student code ends here.

// ***** Task 5:
// Note: search for and complete Task 4 before performing this task
// Part 5 student code starts here:

// declare and instantiate an ActionListener

// register the listener on the 3 buttons
// that you declared in Task 1

// Part 5 student code ends here.

contents.add(bottom, BorderLayout.SOUTH);

setSize(325, 325);
setVisible(true);
}

// Part 4 student code ends here.

public static void main(String[] args)
{
NestedLayoutPractice nl = new NestedLayoutPractice();
nl.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

Explanation / Answer

Solution=================================

/* Practice using layouts
Anderson, Franceschi
*/

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class NestedLayoutPractice extends JFrame {
private Container contents;
private Game game;

private BorderLayout bl;

private JLabel bottom;

   // ***** Task 1: declare a JPanel named top
   // also declare three JButton instance variables
   // that will be added to the JPanel top
   // these buttons will determine the grid size of the game:
   // 3-by-3, 4-by-4, or 5-by-5
   // Part 1 student code starts here:
   JButton three;
   JButton four;
   JButton five;
   JPanel top;
   // Part 1 student code ends here.

   public NestedLayoutPractice() {
       super("Practicing layout managers");
       contents = getContentPane();

       // ***** Task 2:
       // instantiate the BorderLayout manager bl
       // Part 2 student code starts here:
       bl = new BorderLayout();

       // set the layout manager of the content pane contents to bl:
       getContentPane().setLayout(bl);
       game = new Game(3); // instantiating the GamePanel object

       // add panel (game) to the center of the content pane
       getContentPane().add(game, BorderLayout.CENTER);
       // Part 2 student code ends here.

bottom = new JLabel("Have fun playing this Tile Puzzle game", SwingConstants.CENTER);

       // ***** Task 3:
       // instantiate the JPanel component named top
       // Part 3 student code starts here:
       top = new JPanel();
       // set the layout of top to a 1-by-3 grid
       top.setLayout(new GridLayout(1, 3));
       // instantiate the JButtons that determine the grid size
       three = new JButton("3 x 3");
       four = new JButton("4 x 4");
       five = new JButton("5 x 5");
       // add the buttons to JPanel top
       top.add(three);
       top.add(four);
       top.add(five);
       // add JPanel top to the content pane as its north component
       getContentPane().add(top, BorderLayout.NORTH);
       // Part 3 student code ends here.

       // ***** Task 5:
       // Note: search for and complete Task 4 before performing this task
       // Part 5 student code starts here:

       // declare and instantiate an ActionListener
       CommandHandler handler = new CommandHandler();
       // register the listener on the 3 buttons
       three.addActionListener(handler);
       four.addActionListener(handler);
       five.addActionListener(handler);
       // that you declared in Task 1

// Part 5 student code ends here.

contents.add(bottom, BorderLayout.SOUTH);

       setSize(325, 325);
       setVisible(true);
   }

   // ***** Task 4:
   // create a private inner class that implements ActionListener
   // your method should identify which of the 3 buttons
   // was the source of the event
   // depending on which button was pressed,
   // call the setUpGame method of the Game class
   // with arguments 3, 4, or 5
   // the API of that method is:
   // public void setUpGame(int nSides)
   // At the end of the method call validate()
   // Part 4 student code starts here:
   private class CommandHandler implements ActionListener {
       public void actionPerformed(ActionEvent e) {
           Object source = e.getSource();
           if (source == three) {
               game.setUpGame(3);
           } else if (source == four) {
               game.setUpGame(4);
           } else if (source == five) {
               game.setUpGame(5);
           }
           validate();
       }
   }
   // Part 4 student code ends here.

   public static void main(String[] args) {
       NestedLayoutPractice nl = new NestedLayoutPractice();
       nl.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }
}

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