How to convert this procedural programming to object-oriented programming?
- by manus91
I have a source code that is needed to be converted by creating classes, objects and methods.
So far, I've just done by converting the initial main into a separate class. But I don't know what to do with constructor and which variables are supposed to be private. This is the code :
import java.util.*;
public class Card{
private static void shuffle(int[][] cards){
List<Integer> randoms = new ArrayList<Integer>();
Random randomizer = new Random();
for(int i = 0; i < 8;) {
int r = randomizer.nextInt(8)+1;
if(!randoms.contains(r)) {
randoms.add(r);
i++;
}
}
List<Integer> clonedList = new ArrayList<Integer>();
clonedList.addAll(randoms);
Collections.shuffle(clonedList);
randoms.addAll(clonedList);
Collections.shuffle(randoms);
int i=0;
for(int r=0; r < 4; r++){
for(int c=0; c < 4; c++){
cards[r][c] = randoms.get(i);
i++;
}
}
}
public static void play() throws InterruptedException {
int ans = 1;
int preview;
int r1,c1,r2,c2;
int[][] cards = new int[4][4];
boolean[][] cardstatus = new boolean[4][4];
boolean gameover = false;
int moves;
Scanner input = new Scanner(System.in);
do{
moves = 0;
shuffle(cards);
System.out.print("Enter the time(0 to 5) in seconds for the preview of the answer : ");
preview = input.nextInt();
while((preview<0) || (preview>5)){
System.out.print("Invalid time!! Re-enter time(0 - 5) : ");
preview = input.nextInt();
}
preview = 1000*preview;
System.out.println(" ");
for (int i =0; i<4;i++){
for (int j=0;j<4;j++){
System.out.print(cards[i][j]);
System.out.print(" ");
}
System.out.println("");
System.out.println("");
}
Thread.sleep(preview);
for(int b=0;b<25;b++){
System.out.println(" ");
}
for(int r=0;r<4;r++){
for(int c=0;c<4;c++){
System.out.print("*");
System.out.print(" ");
cardstatus[r][c] = false;
}
System.out.println("");
System.out.println(" ");
}
System.out.println("");
do{
do{
System.out.print("Please insert the first card row : ");
r1 = input.nextInt();
while((r1<1) || (r1>4)){
System.out.print("Invalid coordinate!! Re-enter first card row : ");
r1 = input.nextInt();
}
System.out.print("Please insert the first card column : ");
c1 = input.nextInt();
while((c1<1) || (c1>4)){
System.out.print("Invalid coordinate!! Re-enter first card column : ");
c1 = input.nextInt();
}
if(cardstatus[r1-1][c1-1] == true){
System.out.println("The card is already flipped!! Select another card.");
System.out.println("");
}
}while(cardstatus[r1-1][c1-1] != false);
do{
System.out.print("Please insert the second card row : ");
r2 = input.nextInt();
while((r2<1) || (r2>4)){
System.out.print("Invalid coordinate!! Re-enter second card row : ");
r2 = input.nextInt();
}
System.out.print("Please insert the second card column : ");
c2 = input.nextInt();
while((c2<1) || (c2>4)){
System.out.print("Invalid coordinate!! Re-enter second card column : ");
c2 = input.nextInt();
}
if(cardstatus[r2-1][c2-1] == true){
System.out.println("The card is already flipped!! Select another card.");
}
if((r1==r2)&&(c1==c2)){
System.out.println("You can't select the same card twice!!");
continue;
}
}while(cardstatus[r2-1][c2-1] != false);
r1--;
c1--;
r2--;
c2--;
System.out.println("");
System.out.println("");
System.out.println("");
for(int r=0;r<4;r++){
for(int c=0;c<4;c++){
if((r==r1)&&(c==c1)){
System.out.print(cards[r][c]);
System.out.print(" ");
}
else if((r==r2)&&(c==c2)){
System.out.print(cards[r][c]);
System.out.print(" ");
}
else if(cardstatus[r][c] == true){
System.out.print(cards[r][c]);
System.out.print(" ");
}
else{
System.out.print("*");
System.out.print(" ");
}
}
System.out.println(" ");
System.out.println(" ");
}
System.out.println("");
if(cards[r1][c1] == cards[r2][c2]){
System.out.println("Cards Matched!!");
cardstatus[r1][c1] = true;
cardstatus[r2][c2] = true;
}
else{
System.out.println("No cards match!!");
}
Thread.sleep(2000);
for(int b=0;b<25;b++){
System.out.println("");
}
for(int r=0;r<4;r++){
for(int c=0;c<4;c++){
if(cardstatus[r][c] == true){
System.out.print(cards[r][c]);
System.out.print(" ");
}
else{
System.out.print("*");
System.out.print(" ");
}
}
System.out.println("");
System.out.println(" ");
}
System.out.println("");
System.out.println("");
System.out.println("");
gameover = true;
for(int r=0;r<4;r++){
for( int c=0;c<4;c++){
if(cardstatus[r][c]==false){
gameover = false;
break;
}
}
if(gameover==false){
break;
}
}
moves++;
}while(gameover != true);
System.out.println("Congratulations, you won!!");
System.out.println("It required " + moves + " moves to finish it.");
System.out.println("");
System.out.print("Would you like to play again? (1=Yes / 0=No) : ");
ans = input.nextInt();
}while(ans == 1);
}
}
The main class is:
import java.util.*;
public class PlayCard{
public static void main(String[] args) throws InterruptedException{
Card game = new Card();
game.play();
}
}
Should I simplify the Card class by creating other classes?
Through this code, my javadoc has no constructtor. So i need help on this!
