Icons in JTable cells

Question

hi, i have a table and one cell is supposed to tell if an item is a file or a directory, and i want to display dir.png or fil.png depending on the type. this column in the table displays names of files and an icon indicating if its a directory or a file.
please how can i get started with this ?

Answer 1

Try this example, hope this works well on your side.
import java.awt.Component;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.filechooser.FileSystemView;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumnModel;
public class MyTableSample extends JFrame {
     public static void main(String[] args) throws Exception {
          new MyTableSample();
     public MyTableSample() {
          setSize(550, 400);//Set the frame size
          setDefaultCloseOperation(3);//Exit on close
          List<File> list = new ArrayList<File>();//Let's say these are your files store in the List.
          list.add(new File("C:\\test.txt"));//One is a file
          list.add(new File("C:\\downloads"));//And the other a directory
          //Create a table model for the table with 2 columns. One displays the type of file and the other is the filename.
          DefaultTableModel tableModel = new DefaultTableModel(new String[] { "Type", "Filename" }, 0);
          JTable table = new JTable(tableModel);//Create the table.
          TableColumnModel columnModel = table.getColumnModel();//Get the column model instance of the table.
          columnModel.getColumn(0).setPreferredWidth(2);//The icon column should be a bit narrower.
          columnModel.getColumn(1).setPreferredWidth(490);//The filename column is wider.
          columnModel.getColumn(0).setCellRenderer(new IconRenderer());//Set the cell renderer to our custom icon renderer.
          //Populate the rows.
          for (int i = 0; i < list.size(); i++) {
               //the first element of the array (list.get(i)) is a File object. I'll explain below why.
               //the second element of the array (list.get(i).getName()) displays the filename of the file. It could also be list.get(i).getAbsolutePath().
               tableModel.addRow(new Object[] { list.get(i), list.get(i).getName() });
          getContentPane().add(new JScrollPane(table));//Add the table to the frame.
          setVisible(true);//make it visible.
     //This is our custom cell renderer
     class IconRenderer extends DefaultTableCellRenderer {
          @Override
          public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
               //override getTableCellRendererComponent(). This will always return a JLable instance.
               final JLabel label = (JLabel) super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
               //A while ago we passed a File object to the object array. The value variable is the File object itself!
               if (value != null && value instanceof File) {//make sure its not null and an instance of File
                    File file = (File) value;
                    label.setIcon(FileSystemView.getFileSystemView().getSystemIcon(file));//Use this method to set the proper icon for the file.
                    label.setText("");//Blank out your Label's text.
               return label;
}