Saving and printing Images from a 2D array in Java











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I'm writing a test code for a poker game which assigns each image of a card to a space in a 2d array.



I wrote it so the rows are the cards and the columns are the suits.



Hearts = 0, Diamonds = 1, Spades = 2, Clubs = 3 and then Ace to King going from 0-12.



An example would be 10 of Spades would be [9][2]. And the file name would be 92.jpg



I don't know why my code isn't working.



I followed my work template except changed it from 1d to a 2d array.
Right now the following line is throwing a NullPointerException:



card[i][j] = tk.getImage(url);


But something tells me that's not the only thing wrong...



Can someone help me? Thanks!



The source code:



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

public class GameTemplate extends JPanel {

static Image card = new Image [13][4];

public static void main (String args) {

Toolkit tk = Toolkit.getDefaultToolkit();

// HEARTS: 0
//DIAMONDS: 1
//SPADES: 2
//CLUBS: 3

// ACES: 0 TWOS: 1 THREES: 2 FOURS: 3 FIVES: 4 SIXES: 5 SEVENS: 6 EIGHTS: 7 NINES: 8 TENS: 9 JACKS: 10 QUEENS: 11 KINGS: 12

int name = new int [13][4];

for (int i = 0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
URL url = GameTemplate.class.getResource(name[i][j] + ".jpg"); // Loads card images into game
card[i][j] = tk.getImage(url); // assigns card images to the array
}
}

GameTemplate run = new GameTemplate ();
run.image(args);
}

public void image(Graphics g) {
for (int i=0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
g.drawImage(card[i][j], i*194, j*50, this); // display the image
}
}

}
}









share|improve this question
























  • Possible duplicate of What is a NullPointerException, and how do I fix it?
    – Joe C
    Nov 10 at 22:27










  • A little bit, the thing is I don't know if that's it or there's more going on that I'm unaware of. If you could just help me out a little that would be great :)
    – Matthew Smith
    Nov 10 at 22:35






  • 2




    It looks like you may need to learn to use a debugger. Please help yourself to some complementary debugging techniques. If you still have issues afterwards, please edit your question to be more specific with what help you need.
    – Joe C
    Nov 10 at 22:44










  • getResource returns null if the resource can't be found. So tk.getImage is called with null as argument.which causes a NullPointerException along the way,
    – QBrute
    Nov 10 at 22:58















up vote
-1
down vote

favorite












I'm writing a test code for a poker game which assigns each image of a card to a space in a 2d array.



I wrote it so the rows are the cards and the columns are the suits.



Hearts = 0, Diamonds = 1, Spades = 2, Clubs = 3 and then Ace to King going from 0-12.



An example would be 10 of Spades would be [9][2]. And the file name would be 92.jpg



I don't know why my code isn't working.



I followed my work template except changed it from 1d to a 2d array.
Right now the following line is throwing a NullPointerException:



card[i][j] = tk.getImage(url);


But something tells me that's not the only thing wrong...



Can someone help me? Thanks!



The source code:



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

public class GameTemplate extends JPanel {

static Image card = new Image [13][4];

public static void main (String args) {

Toolkit tk = Toolkit.getDefaultToolkit();

// HEARTS: 0
//DIAMONDS: 1
//SPADES: 2
//CLUBS: 3

// ACES: 0 TWOS: 1 THREES: 2 FOURS: 3 FIVES: 4 SIXES: 5 SEVENS: 6 EIGHTS: 7 NINES: 8 TENS: 9 JACKS: 10 QUEENS: 11 KINGS: 12

int name = new int [13][4];

for (int i = 0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
URL url = GameTemplate.class.getResource(name[i][j] + ".jpg"); // Loads card images into game
card[i][j] = tk.getImage(url); // assigns card images to the array
}
}

GameTemplate run = new GameTemplate ();
run.image(args);
}

public void image(Graphics g) {
for (int i=0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
g.drawImage(card[i][j], i*194, j*50, this); // display the image
}
}

}
}









share|improve this question
























  • Possible duplicate of What is a NullPointerException, and how do I fix it?
    – Joe C
    Nov 10 at 22:27










  • A little bit, the thing is I don't know if that's it or there's more going on that I'm unaware of. If you could just help me out a little that would be great :)
    – Matthew Smith
    Nov 10 at 22:35






  • 2




    It looks like you may need to learn to use a debugger. Please help yourself to some complementary debugging techniques. If you still have issues afterwards, please edit your question to be more specific with what help you need.
    – Joe C
    Nov 10 at 22:44










  • getResource returns null if the resource can't be found. So tk.getImage is called with null as argument.which causes a NullPointerException along the way,
    – QBrute
    Nov 10 at 22:58













up vote
-1
down vote

favorite









up vote
-1
down vote

favorite











I'm writing a test code for a poker game which assigns each image of a card to a space in a 2d array.



I wrote it so the rows are the cards and the columns are the suits.



Hearts = 0, Diamonds = 1, Spades = 2, Clubs = 3 and then Ace to King going from 0-12.



An example would be 10 of Spades would be [9][2]. And the file name would be 92.jpg



I don't know why my code isn't working.



I followed my work template except changed it from 1d to a 2d array.
Right now the following line is throwing a NullPointerException:



card[i][j] = tk.getImage(url);


But something tells me that's not the only thing wrong...



Can someone help me? Thanks!



The source code:



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

public class GameTemplate extends JPanel {

static Image card = new Image [13][4];

public static void main (String args) {

Toolkit tk = Toolkit.getDefaultToolkit();

// HEARTS: 0
//DIAMONDS: 1
//SPADES: 2
//CLUBS: 3

// ACES: 0 TWOS: 1 THREES: 2 FOURS: 3 FIVES: 4 SIXES: 5 SEVENS: 6 EIGHTS: 7 NINES: 8 TENS: 9 JACKS: 10 QUEENS: 11 KINGS: 12

int name = new int [13][4];

for (int i = 0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
URL url = GameTemplate.class.getResource(name[i][j] + ".jpg"); // Loads card images into game
card[i][j] = tk.getImage(url); // assigns card images to the array
}
}

GameTemplate run = new GameTemplate ();
run.image(args);
}

public void image(Graphics g) {
for (int i=0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
g.drawImage(card[i][j], i*194, j*50, this); // display the image
}
}

}
}









share|improve this question















I'm writing a test code for a poker game which assigns each image of a card to a space in a 2d array.



I wrote it so the rows are the cards and the columns are the suits.



Hearts = 0, Diamonds = 1, Spades = 2, Clubs = 3 and then Ace to King going from 0-12.



An example would be 10 of Spades would be [9][2]. And the file name would be 92.jpg



I don't know why my code isn't working.



I followed my work template except changed it from 1d to a 2d array.
Right now the following line is throwing a NullPointerException:



card[i][j] = tk.getImage(url);


But something tells me that's not the only thing wrong...



Can someone help me? Thanks!



The source code:



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

public class GameTemplate extends JPanel {

static Image card = new Image [13][4];

public static void main (String args) {

Toolkit tk = Toolkit.getDefaultToolkit();

// HEARTS: 0
//DIAMONDS: 1
//SPADES: 2
//CLUBS: 3

// ACES: 0 TWOS: 1 THREES: 2 FOURS: 3 FIVES: 4 SIXES: 5 SEVENS: 6 EIGHTS: 7 NINES: 8 TENS: 9 JACKS: 10 QUEENS: 11 KINGS: 12

int name = new int [13][4];

for (int i = 0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
URL url = GameTemplate.class.getResource(name[i][j] + ".jpg"); // Loads card images into game
card[i][j] = tk.getImage(url); // assigns card images to the array
}
}

GameTemplate run = new GameTemplate ();
run.image(args);
}

public void image(Graphics g) {
for (int i=0; i < 13; i++) {
for (int j = 0; j < 4; j++) {
g.drawImage(card[i][j], i*194, j*50, this); // display the image
}
}

}
}






java arrays image static






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 10 at 23:41

























asked Nov 10 at 22:25









Matthew Smith

118




118












  • Possible duplicate of What is a NullPointerException, and how do I fix it?
    – Joe C
    Nov 10 at 22:27










  • A little bit, the thing is I don't know if that's it or there's more going on that I'm unaware of. If you could just help me out a little that would be great :)
    – Matthew Smith
    Nov 10 at 22:35






  • 2




    It looks like you may need to learn to use a debugger. Please help yourself to some complementary debugging techniques. If you still have issues afterwards, please edit your question to be more specific with what help you need.
    – Joe C
    Nov 10 at 22:44










  • getResource returns null if the resource can't be found. So tk.getImage is called with null as argument.which causes a NullPointerException along the way,
    – QBrute
    Nov 10 at 22:58


















  • Possible duplicate of What is a NullPointerException, and how do I fix it?
    – Joe C
    Nov 10 at 22:27










  • A little bit, the thing is I don't know if that's it or there's more going on that I'm unaware of. If you could just help me out a little that would be great :)
    – Matthew Smith
    Nov 10 at 22:35






  • 2




    It looks like you may need to learn to use a debugger. Please help yourself to some complementary debugging techniques. If you still have issues afterwards, please edit your question to be more specific with what help you need.
    – Joe C
    Nov 10 at 22:44










  • getResource returns null if the resource can't be found. So tk.getImage is called with null as argument.which causes a NullPointerException along the way,
    – QBrute
    Nov 10 at 22:58
















Possible duplicate of What is a NullPointerException, and how do I fix it?
– Joe C
Nov 10 at 22:27




Possible duplicate of What is a NullPointerException, and how do I fix it?
– Joe C
Nov 10 at 22:27












A little bit, the thing is I don't know if that's it or there's more going on that I'm unaware of. If you could just help me out a little that would be great :)
– Matthew Smith
Nov 10 at 22:35




A little bit, the thing is I don't know if that's it or there's more going on that I'm unaware of. If you could just help me out a little that would be great :)
– Matthew Smith
Nov 10 at 22:35




2




2




It looks like you may need to learn to use a debugger. Please help yourself to some complementary debugging techniques. If you still have issues afterwards, please edit your question to be more specific with what help you need.
– Joe C
Nov 10 at 22:44




It looks like you may need to learn to use a debugger. Please help yourself to some complementary debugging techniques. If you still have issues afterwards, please edit your question to be more specific with what help you need.
– Joe C
Nov 10 at 22:44












getResource returns null if the resource can't be found. So tk.getImage is called with null as argument.which causes a NullPointerException along the way,
– QBrute
Nov 10 at 22:58




getResource returns null if the resource can't be found. So tk.getImage is called with null as argument.which causes a NullPointerException along the way,
– QBrute
Nov 10 at 22:58

















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