import javax.swing.*; import java.util.ArrayList; import java.util.Collections; import java.util.Random; import java.awt.*; import java.awt.event.*; public class memory extends JFrame implements ActionListener { private JButton[] cards; private ImageIcon[] icons; private int[] iconIDs; private JButton firstButton; private ImageIcon firstIcon; private int numMatches; public memory() { setTitle("Memory Matching Game"); setSize(800, 600); setLayout(new BorderLayout()); JPanel boardPanel = new JPanel(new GridLayout(4, 4)); add(boardPanel, BorderLayout.CENTER); icons = new ImageIcon[8]; for (int i = 1; i <= 8; i++) { icons[i-1] = new ImageIcon("image" + i + ".png"); } iconIDs = new int[16]; for (int i = 0; i < 8; i++) { iconIDs[2*i] = i; iconIDs[2*i+1] = i; } Random rand = new Random(); for (int i = 0; i < 16; i++) { int index = rand.nextInt(16); int temp = iconIDs[i]; iconIDs[i] = iconIDs[index]; iconIDs[index] = temp; } cards = new JButton[16]; for (int i = 0; i < 16; i++) { cards[i] = new JButton(); cards[i].setPreferredSize(new Dimension(150, 150)); cards[i].addActionListener(this); boardPanel.add(cards[i]); } resetGame(); } private void resetGame() { numMatches = 0; firstButton = null; firstIcon = null; for (int i = 0; i < 16; i++) { cards[i].setEnabled(true); cards[i].setIcon(null); } for (int i = 0; i < 16; i++) { int id = iconIDs[i]; cards[i].putClientProperty("id", id); } } private void handleCardClick(JButton button) { int id = (int) button.getClientProperty("id"); ImageIcon icon = icons[id]; if (firstIcon == null) { // first card clicked firstIcon = icon; firstButton = button; button.setIcon(icon); button.setEnabled(false); } else { // second card clicked if (icon == firstIcon) { // matching cards numMatches++; button.setIcon(icon); button.setEnabled(false); firstButton = null; firstIcon = null; } else { // non-matching cards firstButton.setEnabled(true); firstButton.setIcon(null); firstButton = null; firstIcon = null; button.setIcon(null); button.setEnabled(false); } } if (numMatches == 8) { // game over int choice = JOptionPane.showConfirmDialog(this, "Congratulations, you won!\nDo you want to play again?", "Game Over", JOptionPane.YES_NO_OPTION); if (choice == JOptionPane.YES_OPTION) { resetGame(); } else { System.exit(0); } } } @Override public void actionPerformed(ActionEvent e) { JButton button = (JButton) e.getSource(); handleCardClick(button); } public static void main(String[] args) { memory game = new memory(); game.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } please tell me why my code wont execute but it has no errrors and how I might fix the issue.

import javax.swing.; import java.util.ArrayList; import java.util.Collections; import java.util.Random; import java.awt.; import java.awt.event.; public class memory extends JFrame implements ActionListener { private JButton[] cards; private ImageIcon[] icons; private int[] iconIDs; private JButton firstButton; private ImageIcon firstIcon; private int numMatches; public memory() { setTitle("Memory Matching Game"); setSize(800, 600); setLayout(new BorderLayout()); JPanel boardPanel = new JPanel(new GridLayout(4, 4)); add(boardPanel, BorderLayout.CENTER); icons = new ImageIcon[8]; for (int i = 1; i <= 8; i++) { icons[i-1] = new ImageIcon("image" + i + ".png"); } iconIDs = new int[16]; for (int i = 0; i < 8; i++) { iconIDs[2i] = i; iconIDs[2*i+1] = i; } Random rand = new Random(); for (int i = 0; i < 16; i++) { int index = rand.nextInt(16); int temp = iconIDs[i]; iconIDs[i] = iconIDs[index]; iconIDs[index] = temp; } cards = new JButton[16]; for (int i = 0; i < 16; i++) { cards[i] = new JButton(); cards[i].setPreferredSize(new Dimension(150, 150)); cards[i].addActionListener(this); boardPanel.add(cards[i]); } resetGame(); } private void resetGame() { numMatches = 0; firstButton = null; firstIcon = null; for (int i = 0; i < 16; i++) { cards[i].setEnabled(true); cards[i].setIcon(null); } for (int i = 0; i < 16; i++) { int id = iconIDs[i]; cards[i].putClientProperty("id", id); } } private void handleCardClick(JButton button) { int id = (int) button.getClientProperty("id"); ImageIcon icon = icons[id]; if (firstIcon == null) { // first card clicked firstIcon = icon; firstButton = button; button.setIcon(icon); button.setEnabled(false); } else { // second card clicked if (icon == firstIcon) { // matching cards numMatches++; button.setIcon(icon); button.setEnabled(false); firstButton = null; firstIcon = null; } else { // non-matching cards firstButton.setEnabled(true); firstButton.setIcon(null); firstButton = null; firstIcon = null; button.setIcon(null); button.setEnabled(false); } } if (numMatches == 8) { // game over int choice = JOptionPane.showConfirmDialog(this, "Congratulations, you won!\nDo you want to play again?", "Game Over", JOptionPane.YES_NO_OPTION); if (choice == JOptionPane.YES_OPTION) { resetGame(); } else { System.exit(0); } } } @Override public void actionPerformed(ActionEvent e) { JButton button = (JButton) e.getSource(); handleCardClick(button); } public static void main(String[] args) { memory game = new memory(); game.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } please tell me why my code wont execute but it has no errrors and how I might fix the issue.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

import javax.swing.*;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Random;

import java.awt.*;

import java.awt.event.*;

public class memory extends JFrame implements ActionListener {

private JButton[] cards;

private ImageIcon[] icons;

private int[] iconIDs;

private JButton firstButton;

private ImageIcon firstIcon;

private int numMatches;

public memory() {

setTitle("Memory Matching Game");

setSize(800, 600);

setLayout(new BorderLayout());

JPanel boardPanel = new JPanel(new GridLayout(4, 4));

add(boardPanel, BorderLayout.CENTER);

icons = new ImageIcon[8];

for (int i = 1; i <= 8; i++) {

icons[i-1] = new ImageIcon("image" + i + ".png");

}

iconIDs = new int[16];

for (int i = 0; i < 8; i++) {

iconIDs[2*i] = i;

iconIDs[2*i+1] = i;

}

Random rand = new Random();

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

int index = rand.nextInt(16);

int temp = iconIDs[i];

iconIDs[i] = iconIDs[index];

iconIDs[index] = temp;

}

cards = new JButton[16];

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

cards[i] = new JButton();

cards[i].setPreferredSize(new Dimension(150, 150));

cards[i].addActionListener(this);

boardPanel.add(cards[i]);

}

resetGame();

}

private void resetGame() {

numMatches = 0;

firstButton = null;

firstIcon = null;

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

cards[i].setEnabled(true);

cards[i].setIcon(null);

}

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

int id = iconIDs[i];

cards[i].putClientProperty("id", id);

}

private void handleCardClick(JButton button) {

int id = (int) button.getClientProperty("id");

ImageIcon icon = icons[id];

if (firstIcon == null) {

// first card clicked

firstIcon = icon;

firstButton = button;

button.setIcon(icon);

button.setEnabled(false);

} else {

// second card clicked

if (icon == firstIcon) {

// matching cards

numMatches++;

button.setIcon(icon);

button.setEnabled(false);

firstButton = null;

firstIcon = null;

} else {

// non-matching cards

firstButton.setEnabled(true);

firstButton.setIcon(null);

firstButton = null;

firstIcon = null;

button.setIcon(null);

button.setEnabled(false);

}

if (numMatches == 8) {

// game over

int choice = JOptionPane.showConfirmDialog(this, "Congratulations, you won!\nDo you want to play again?", "Game Over", JOptionPane.YES_NO_OPTION);

if (choice == JOptionPane.YES_OPTION) {

resetGame();

} else {

System.exit(0);

}

@Override

public void actionPerformed(ActionEvent e) {

JButton button = (JButton) e.getSource();

handleCardClick(button);

}

public static void main(String[] args) {

memory game = new memory();

game.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

please tell me why my code wont execute but it has no errrors and how I might fix the issue.

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