title: Showing a 2D array in a JTable in Java
body: <p>I have 2 classes, WordSearch.java is where all the main code is held and WordSearchSwing.java is where I wish to create a JTable to display the 2D array "letters". The JTable doesn't display any content (just 12 blank cells) when the following code is run.  I cannot figure out why it will not work, any help would be much appreciated.</p>
  
  <p>WordSearch Class:</p>
  
  <pre><code>import java.util.ArrayList;
  
  public class WordSearch {
  
      public static String[][] letters = new String[12][12];
      static ArrayList&lt;String&gt; words = new ArrayList&lt;String&gt;();
  
      public static void main(String[] args) {
  
  
          //populating the arrayList with Strings, some which are in the wordsearch and some which aren't
          words.add("ghost");     words.add("knife");     words.add("patch");     words.add("ghoul");     words.add("apple");
          words.add("boo");       words.add("spider");    words.add("pumpkin");   words.add("house");     words.add("trick");
          words.add("cat");       words.add("candy");     words.add("orange");    words.add("rat");       words.add("crow");
          words.add("blood");     words.add("bats");      words.add("neck");      words.add("mask");      words.add("witch");
          words.add("party");     words.add("broom");     words.add("fangs");     words.add("mummy"); 
  
          //A 2D array is used to make the wordsearch
          //Here each coordinate is assigned a letter
          letters[0][0] = "o";    letters[1][0] = "e";    letters[2][0] = "o";    letters[3][0] = "e";    letters[4][0] = "b";    letters[5][0] = "o";
          letters[0][1] = "h";    letters[1][1] = "n";    letters[2][1] = "i";    letters[3][1] = "l";    letters[4][1] = "t";    letters[5][1] = "r";
          letters[0][2] = "b";    letters[1][2] = "c";    letters[2][2] = "o";    letters[3][2] = "d";    letters[4][2] = "y";    letters[5][2] = "a";
          letters[0][3] = "d";    letters[1][3] = "o";    letters[2][3] = "t";    letters[3][3] = "m";    letters[4][3] = "d";    letters[5][3] = "n";
          letters[0][4] = "d";    letters[1][4] = "h";    letters[2][4] = "m";    letters[3][4] = "a";    letters[4][4] = "c";    letters[5][4] = "g";
          letters[0][5] = "p";    letters[1][5] = "u";    letters[2][5] = "o";    letters[3][5] = "a";    letters[4][5] = "p";    letters[5][5] = "e";
          letters[0][6] = "m";    letters[1][6] = "u";    letters[2][6] = "n";    letters[3][6] = "u";    letters[4][6] = "t";    letters[5][6] = "r";
          letters[0][7] = "m";    letters[1][7] = "d";    letters[2][7] = "m";    letters[3][7] = "k";    letters[4][7] = "s";    letters[5][7] = "e";
          letters[0][8] = "y";    letters[1][8] = "d";    letters[2][8] = "c";    letters[3][8] = "p";    letters[4][8] = "h";    letters[5][8] = "e";
          letters[0][9] = "w";    letters[1][9] = "e";    letters[2][9] = "i";    letters[3][9] = "e";    letters[4][9] = "k";    letters[5][9] = "r";
          letters[0][10] = "n";   letters[1][10] = "y";   letters[2][10] = "n";   letters[3][10] = "e";   letters[4][10] = "o";   letters[5][10] = "i";
          letters[0][11] = "c";   letters[1][11] = "t";   letters[2][11] = "f";   letters[3][11] = "h";   letters[4][11] = "o";   letters[5][11] = "w";
  
          letters[6][0] = "b";    letters[7][0] = "o";    letters[8][0] = "o";    letters[9][0] = "l";    letters[10][0] = "c";   letters[11][0] = "h";
          letters[6][1] = "o";    letters[7][1] = "b";    letters[8][1] = "h";    letters[9][1] = "t";    letters[10][1] = "a";   letters[11][1] = "s";
          letters[6][2] = "g";    letters[7][2] = "h";    letters[8][2] = "o";    letters[9][2] = "s";    letters[10][2] = "t";   letters[11][2] = "g";
          letters[6][3] = "r";    letters[7][3] = "b";    letters[8][3] = "a";    letters[9][3] = "t";    letters[10][3] = "s";   letters[11][3] = "n";
          letters[6][4] = "e";    letters[7][4] = "o";    letters[8][4] = "f";    letters[9][4] = "u";    letters[10][4] = "t";   letters[11][4] = "a";
          letters[6][5] = "d";    letters[7][5] = "e";    letters[8][5] = "f";    letters[9][5] = "t";    letters[10][5] = "m";   letters[11][5] = "f";
          letters[6][6] = "i";    letters[7][6] = "c";    letters[8][6] = "k";    letters[9][6] = "o";    letters[10][6] = "p";   letters[11][6] = "m";
          letters[6][7] = "p";    letters[7][7] = "h";    letters[8][7] = "o";    letters[9][7] = "e";    letters[10][7] = "a";   letters[11][7] = "a";
          letters[6][8] = "s";    letters[7][8] = "r";    letters[8][8] = "c";    letters[9][8] = "l";    letters[10][8] = "r";   letters[11][8] = "s";
          letters[6][9] = "b";    letters[7][9] = "r";    letters[8][9] = "d";    letters[9][9] = "p";    letters[10][9] = "t";   letters[11][9] = "k";
          letters[6][10] = "o";   letters[7][10] = "o";   letters[8][10] = "e";   letters[9][10] = "p";   letters[10][10] = "y";  letters[11][10] = "e";
          letters[6][11] = "n";   letters[7][11] = "l";   letters[8][11] = "u";   letters[9][11] = "a";   letters[10][11] = "a";  letters[11][11] = "s";
  
  
          //searchAcross();
          //searchDown();
      }
  
      //A method used to search across the grid for words
      public static void searchAcross(){
          for (int i =0; i &lt; 12; i++) {
              for (int j = 0; j &lt; 12; j++) {
                  for (int k = 0; k &lt; words.size(); k++){
                      if (words.get(k).contains(letters[i][j]) &amp;&amp; (words.get(k).contains(letters[i][j+1])) &amp;&amp; (words.get(k).contains(letters[i][j+2]))){
                          System.out.println(words.get(k));
                          }
                      }
                  }
              }
          }
  
      // A method used to search down the grid for words
      public static void searchDown(){
          for (int j =0; j &lt; 12; j++) {
              for (int i = 0; i &lt; 12; i++) {
                  for (int k = 0; k &lt; words.size(); k++){
                      if (words.get(k).contains(letters[j][i]) &amp;&amp; (words.get(k).contains(letters[j][i+1])) &amp;&amp; (words.get(k).contains(letters[j][i+2]))){
                          System.out.println(words.get(k));
                          }
                      }
                  }
              }
      }
  }
  </code></pre>
  
  <p>WordSearchSwing Class:</p>
  
  <pre><code>import javax.swing.*;
  public class WordSearchSwing {
  
      private JPanel contentPane;
      private JTable table;
  
      /**
       * Launch the application.
       */
      public static void main(String[] args) {
          EventQueue.invokeLater(new Runnable() {
              public void run() {
                  try {
                      WordSearchSwing frame = new WordSearchSwing();
                      frame.setVisible(true);
                  } catch (Exception e) {
                      e.printStackTrace();
                  }
              }
          });
      }
  
      /**
       * Create the frame.
       */
      public WordSearchSwing() {
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setBounds(100, 100, 450, 300);
          contentPane = new JPanel();
          contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
          contentPane.setLayout(new BorderLayout(0, 0));
          setContentPane(contentPane);
  
          Object[] title = {"Happy Halloween"};
          table = new JTable(WordSearch.letters, title);
          contentPane.add(table, BorderLayout.CENTER);
      }
  
  }
  </code></pre>