Machine Problem Problems

/* ?GeorgeMC 2007 */

JPanel panel = new JPanel(new FlowLayout());

ask your professor for some clarity regarding point 2. doesn't make much sense really. transform buttons to labels? event handling? demand that he explain himself!

a handy link for the future http://java.sun.com/j2se/1.5.0/docs/api/

georgemca at 2007-7-10 12:13:16 >

MinesweeperButtons[][] MB;

MB[][] = new MinesweeperButtons[5][5]; //line 15

for(int i = 0; i < 5; i++){ //line 16

for(int j = 0; j < 5; j++){

MB[i][j] = MinesweeperButtons(5, 5);

}

}

The first line declares an array called MB

The second line initializes that array. Don't put [][] after MB here, MB is already declared as an array.

The rest of this if a loop that initializes each position of the array with a new MinesweeperButton.

Only declarations can be outside of a method or constructor. Put the second and third parts in the constructor. If you want to initialize the array and declare it at the same time, do this:

MinesweeperButtons[][] MB = new MinesweeperButtons[5][5];

Read through this tutorial for more information:

http://java.sun.com/docs/books/tutorial/java/javaOO/classes.html

hunter9000a at 2007-7-10 12:13:17 >

> did i put the for loops in the right place?

No, not in the last code you posted. Put this with the member declarations:

MinesweeperButtons[][] MB;

And put this in the constructor:

MB = new MinesweeperButtons[5][5]; // notice the removed [][] after MB

for(int i = 0; i < 5; i++){

for(int j = 0; j < 5; j++){

MB[i][j] = new MinesweeperButtons(5, 5);// notice the new keyword

}

}

hunter9000a at 2007-7-10 12:13:17 >

In the MinesweeperButtons class, you never initialize the JButton. The MinesweeperButtons constructor creates an array of MinesweeperButtons, but never initializes them. You should not be creating an array of that class in the constructor for that class. If you were initializing them, it would cause an infinite loop until you ran out of memory. What are the width and height that you pass to the constructor used for? You have a method createButtons that initializes each of the members bomb, strBomb, and button, but you never call it, so button is always null, hence the null pointer exception when you call getButton().

import java.math.*;

import javax.swing.*;

public class MinesweeperButtons{

private int bomb = 0;

private String strBomb = "";

private JButton button;

public MinesweeperButtons(int rows, int columns){

//MinesweeperButtons MB[][] = new MinesweeperButtons[rows][columns];// don't do this, it's not needed for anything.

createButtons();

}

public void createButtons(/*int bomb, String strBomb, JButton button*/){

this.bomb = (int) ((Math.random()) * 10) % 3;

this.strBomb = Integer.toString(bomb);

this.button = new JButton(strBomb);

}

public JButton getButton(){

return button;

}

}

hunter9000a at 2007-7-10 12:13:17 >

ok i have a new problem (boy talk about machine problem PROBLEMS)

how can i make a certain class which requires event handling a subclass of another class?

for example, i have a class MinesweeperMain

i have another class MinesweeperButton5x5

which needs event handling, therefore having the declaration

public class MinesweeperButton5x5 extends JPanel implements ActionListener{

}

how do i make MinesweeperButton5x5

a subclass of MinesweeperMain

?

i hope i'm not being too much of a nuisance...but this is due in 48 hours...any help will be duly acknowledged.

FolkFolka at 2007-7-21 19:17:55 >

help...

here's what i want to happen:

whenever I click on the button with 10x10, i want the grid size to change.

this is my code:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class MinesweeperMain extends JPanel implements ActionListener{

protected int areaDimension = 5; //I think this is where the problem lingers

JFrame frame;

JPanel mainPanel;

JPanel gridSize;

JPanel mineArea;

JPanel mineCounter;

JButton newGame;

JLabel counter;

Container contentPane;

MinesweeperButton5x5 MB5x5;

MinesweeperButton10x10 MB10x10;

MinesweeperButtons[][] MB;

void launch(){

int mines = 0;

MB5x5 = new MinesweeperButton5x5();

MB10x10 = new MinesweeperButton10x10();

MB = new MinesweeperButtons[areaDimension][areaDimension];

for(int i = 0; i < areaDimension; i++){

for(int j = 0; j < areaDimension; j++){

MB[i][j] = new MinesweeperButtons();

}

}

for(int i = 0; i < areaDimension; i++){

for(int j = 0; j < areaDimension; j++){

if(MB[i][j].getBomb() == 0)

mines++;

}

}

frame = new JFrame("Minesweeper");

mainPanel = new JPanel(new BorderLayout());

gridSize = new JPanel(new BorderLayout());

mineArea = new JPanel(new GridLayout(areaDimension, areaDimension));

mineCounter = new JPanel(new BorderLayout());

counter = new JLabel("Mines in the area: "+mines+"");

newGame = new JButton("Start a new game");

contentPane = frame.getContentPane();

gridSize.add(MB5x5.getButton5x5(), BorderLayout.WEST);

gridSize.add(newGame, BorderLayout.CENTER);

gridSize.add(MB10x10.getButton10x10(), BorderLayout.EAST);

for(int i = 0; i < areaDimension; i++){

for(int j = 0; j < areaDimension; j++){

mineArea.add(MB[i][j].getButton());

}

}

mineCounter.add(counter, BorderLayout.EAST);

mainPanel.add(gridSize, BorderLayout.NORTH);

mainPanel.add(mineArea, BorderLayout.CENTER);

mainPanel.add(mineCounter, BorderLayout.SOUTH);

contentPane.add(mainPanel);

frame.pack();

frame.setVisible(true);

}

public void actionPerformed(ActionEvent e){ //This has no function. It's here just to override the ActionListener class.

}

public static void main(String args[]){

MinesweeperMain MM = new MinesweeperMain();

MM.launch();

}

}

here's the MinesweeperButton10x10 class:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class MinesweeperButton10x10 extends MinesweeperMain{

private JButton button10x10;

public MinesweeperButton10x10() {

button10x10 = new JButton("10x10");

}

public void actionPerformed(ActionEvent e){

super.areaDimension = 10;

}

public JButton getButton10x10(){

return button10x10;

}

}

what happens is that the code compiles, but the grid size doesn't change. what did i do wrong?

FolkFolka at 2007-7-21 19:17:55 >

*deep breath*

almost done...

however, i have a problem.

i redid the design of Minesweeper so that the game would simply alter the difficulty of the game. however, I couldn't seem to change the number of bombs in the game whenever i click on the buttons.

here's the main class:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class MinesweeperMain extends JButton implements ActionListener{

protected int areaDimension = 10;

protected int difficultyModifier = 10; //used in MinesweeperButtons

JFrame frame;

JPanel mainPanel;

JPanel panelNewGame;

JPanel setDifficulty;

JPanel mineArea;

JPanel mineCounter;

JButton newGame;

JLabel counter;

Container contentPane;

SetEasy easy;

SetNormal normal;

SetHard hard;

MinesweeperButtons[][] MB;

protected void launch(){

int mines = 0;

easy = new SetEasy();

normal = new SetNormal();

hard = new SetHard();

MB = new MinesweeperButtons[areaDimension][areaDimension];

for(int i = 0; i < areaDimension; i++){

for(int j = 0; j < areaDimension; j++){

MB[i][j] = new MinesweeperButtons();

}

}

for(int i = 0; i < areaDimension; i++){

for(int j = 0; j < areaDimension; j++){

MB[i][j].createBomb(difficultyModifier);

if(MB[i][j].getBomb() == 0)

mines++; //I can't seem to change the value of mines, the indication of how many mines there are in the game.

}

}

frame = new JFrame("Minesweeper");

mainPanel = new JPanel(new BorderLayout());

panelNewGame = new JPanel(new BorderLayout());

setDifficulty = new JPanel(new BorderLayout());

mineArea = new JPanel(new GridLayout(areaDimension, areaDimension));

mineCounter = new JPanel(new BorderLayout());

counter = new JLabel("Mines in the area: "+mines+"");

newGame = new JButton("Start a new game");

contentPane = frame.getContentPane();

panelNewGame.add(newGame, BorderLayout.CENTER);

setDifficulty.add(easy.getButtonEasy(), BorderLayout.WEST);

setDifficulty.add(normal.getButtonNormal(), BorderLayout.CENTER);

setDifficulty.add(hard.getButtonHard(), BorderLayout.EAST);

for(int i = 0; i < areaDimension; i++){

for(int j = 0; j < areaDimension; j++){

mineArea.add(MB[i][j].getButton());

}

}

mineCounter.add(counter, BorderLayout.EAST);

mainPanel.add(panelNewGame, BorderLayout.WEST);

mainPanel.add(setDifficulty, BorderLayout.NORTH);

mainPanel.add(mineArea, BorderLayout.CENTER);

mainPanel.add(mineCounter, BorderLayout.SOUTH);

contentPane.add(mainPanel);

frame.pack();

frame.setVisible(true);

}

public void actionPerformed(ActionEvent e){ //This has no function. It's here just to override the ActionListener class.

}

public static void main(String args[]){

MinesweeperMain MM = new MinesweeperMain();

MM.launch();

}

}

here's the SetEasy class:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class SetEasy extends MinesweeperMain {

private JButton buttonEasy;

public SetEasy() {

buttonEasy = new JButton("Easy");

buttonEasy.addActionListener(easy);

}

public void actionPerformed(ActionEvent e){

super.difficultyModifier = 10;

super.launch();

}

public JButton getButtonEasy(){

return buttonEasy;

}

}

here's the SetNormal class

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class SetNormal extends MinesweeperMain {

private JButton buttonNormal;

public SetNormal() {

buttonNormal = new JButton("Normal");

buttonNormal.addActionListener(normal);

}

public void actionPerformed(ActionEvent e){

super.difficultyModifier = 5;

super.launch();

}

public JButton getButtonNormal(){

return buttonNormal;

}

}

here's the SetHard class:

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class SetHard extends MinesweeperMain {

private JButton buttonHard;

public SetHard() {

buttonHard = new JButton("Hard");

buttonHard.addActionListener(hard);

}

public void actionPerformed(ActionEvent e){

super.difficultyModifier = 2;

super.launch();

}

public JButton getButtonHard(){

return buttonHard;

}

}

and, finally, the MinesweeperButtons class. by the way, i don't know what to put in the parameters of addActionListener method.

import java.math.*;

import javax.swing.*;

import java.awt.*;

public class MinesweeperButtons extends MinesweeperMain{

private int bomb = 0;

private String strBomb = "";

private JButton button;

public MinesweeperButtons(){

createButtons(button);

}

public void createBomb(int difficultyModifier){

this.difficultyModifier = difficultyModifier; //higher value means less instances of having 0 as a value for bomb, therefore making the game easier

bomb = (int) (Math.random() * 10) % difficultyModifier;

}

public void createButtons(JButton button){

this.button = new JButton();

this.button.addActionListener(/*what do I put here?*/);

}

public JButton getButton(){

return button;

}

public int getBomb(){

return bomb;

}

}

FolkFolka at 2007-7-21 19:17:55 >