Instead of the picture it shows me the x.png inside the cell, how can i make it SHOW the actual picture or put some background color when value=="1"

Question

package dmaze2;

import java.awt.Dimension;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class Dmaze2 extends JPanel
{
    JTable jt;

    public Dmaze2()
    {
       String[] columns = {"1","2","3","4","5","6","7","8"};
       Object[][] table={{"f","f","f","f","f","f","f","f"},

//if this table is string makes problem to add picture

      {"f","f","f","f","f","f","f","f"},
      {"f","f","f","f","f","f","f","f"},
      {"f","f","f","f","f","f","f","f"},
      {"f","f","f","o","f","f","f","f"},
      {"f","f","f","f","f","f","f","f"},
      {"f","f","f","f","f","f","f","f"},
      {"f","f","f","f","f","f","f","f"}};
      int num=0;
      ImageIcon Icon = new ImageIcon("x.png");

//i have the image in all files of the project to be sure it finds it

       for (int i = 0; i < 8 ; i++)
        {
         int a=1;   
         for (int j = 0; j<7 && a<8; j++,a++)
         {               
           if(table[i][j]=="f" && table[i][a]=="f")            
           {
              num=num+1;
              table[i][j]=Icon;
//if i try to enter the image here it will show it as x.png (as string) instead of the actual picture

              table[i][a]="u";              
           }

         }
           //int b=1;
           for (int j = 0; j<8 && i<7; j++)
           {
            if(table[i][j]=="f" && table[i+1][j]=="f")               
           {
              num=num+1;
              table[i][j]="u";//we put the block used
              table[i+1][j]="u";              
           }
          }               
           System.out.println("");
        }         
       jt = new JTable(table,columns);    
       { 
       }
       jt.setPreferredScrollableViewportSize(new Dimension(350,363));         
       jt.setFillsViewportHeight(true);           
       JScrollPane jps = new JScrollPane(jt);
       add(jps);
    }
    public static void main(String[] args) 
    {
        JFrame jf = new JFrame();
        Dmaze2 t = new Dmaze2();
        jf.setTitle("Depth First Search");
        jf.setSize(500, 500);
        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.add(t);
    }        
}

Answer 1

You need to @Override the getColumnClass() of the table's XxxTableModel. If you don't the renderer will render the column as the Object.toString(). See more at Concepts: Editors and Renderers

DefaultTableModel model = new DefaultTableModel(tableData, columns) {
    @Override
    public Class<?> getColumnClass(int column) {
        switch(column) {
            case 1: return ImageIcon.class;  // or whichever column you want
            default: return String.class;
        }
    }
};
JTable table = new JTable(model);

---

Side Notes:

• Have a look at How Do I Compare Strings in Java

• Set your frame visible after adding all your components

• Swing apps should be run on the Event Dispatch Thread. See more at Initial Threads

• You may want to read your image files from the class path if the images are resources of your application. Passing a String path to the ImageIcon signifies a read from the local file system. At time of deployment, the path you use will no longer be valid. See the answers from this question and this question for more details on how you can accomplish this task of reading from the class path and embedding your resources.