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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;

// ***** 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:

// 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);
}

// ***** 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:

// Part 4 student code ends here.

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

Explanation / Answer

Hello,
Here is your code

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;
private JPanel top;
private JButton three,four,five;

public NestedLayoutPractice()
{
    super("Practicing layout managers");
    contents = getContentPane();
    bl=new BorderLayout();
    game = new Game(3);
    contents.add(game, BorderLayout.CENTER);
    bottom = new JLabel("Have fun playing this Tile Puzzle game",
      SwingConstants.CENTER);

    top=new JPanel();
    top.setLayout(new GridLayout(1,3));
    three=new JButton("3 x 3");
    four=new JButton("4 x 4");
    five=new JButton("5 x 5");

    top.add(three);
    top.add(four);
    top.add(five);

    contents.add(top,BorderLayout.NORTH);

    three.addActionListener(this);
    four.addActionListener(this);
    five.addActionListener(this);

    // Part 5 student code ends here.

    contents.add(bottom, BorderLayout.SOUTH);
    setSize(325, 325);
    setVisible(true);
}

private class ButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
    Object source = e.getSource();
    if (source == three)
    {
      game.setUpGame(3);
      validate();
      return;
    }
    if (source == four)
    {
      game.setUpGame(4);
      validate();
      return;
    }
    if (source == five)
    {
      game.setUpGame(5);
      validate();
      return;
    }
}

// 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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