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A Simple Table Example Java Code Program

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Java Code:

The following code shows how to use the JTable class to create a simple table as part of a GUI. The AbstractTableModel class is used as a data manager for the JTable.

The ste-by-step guide that goes with this example code program is How to Create a Simple Table.


//Imports are listed in full to show what's being used
//could just import javax.swing.* and java.awt.* etc..
import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JComboBox;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.DefaultCellEditor;

public class TableExample {

    //Note: Typically the main method will be in a
    //separate class. As this is a simple one class
    //example it's all in the one class.
    public static void main(String[] args) {
     
         //Use the event dispatch thread for Swing components
         EventQueue.invokeLater(new Runnable()
         {
             
            @Override
             public void run()
             {
                 
                 new TableExample();         
             }
         });
              
    }
    
    public TableExample()
    {
        JFrame guiFrame = new JFrame();
        
        //make sure the program exits when the frame closes
        guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        guiFrame.setTitle("Creating a Table Example");
        guiFrame.setSize(700,200);
      
        //This will center the JFrame in the middle of the screen
        guiFrame.setLocationRelativeTo(null);
        
        //Create the JTable using the ExampleTableModel implementing 
        //the AbstractTableModel abstract class
        JTable table = new JTable(new ExampleTableModel());
        
        //Set the column sorting functionality on
        table.setAutoCreateRowSorter(true);
        
        //Uncomment the next line if you want to turn the grid lines off
      //  table.setShowGrid(false);
        
        //Change the colour of the table - yellow for gridlines 
        //blue for background
        table.setGridColor(Color.YELLOW);
        table.setBackground(Color.CYAN);
        
        //String array to populate the combobox options
        String[] countries = {"Australia", "Brazil", "Canada", "China"
                    ,"France", "Japan", "Norway", "Russia", "South Korea"
                    , "Tunisia", "USA"};
        JComboBox countryCombo = new JComboBox(countries);
       
        //Set the default editor for the Country column to be the combobox
        TableColumn countryColumn = table.getColumnModel().getColumn(2);
        countryColumn.setCellEditor(new DefaultCellEditor(countryCombo));
       
        //set the Event column to be larger than the rest and the Place column 
        //to be smaller
        TableColumn eventColumn = table.getColumnModel().getColumn(3);
        eventColumn.setPreferredWidth(150);
        
        TableColumn placeColumn = table.getColumnModel().getColumn(4);
        placeColumn.setPreferredWidth(5);
        
        //Place the JTable object in a JScrollPane for a scrolling table
        JScrollPane tableScrollPane = new JScrollPane(table);
        
        guiFrame.add(tableScrollPane);
        guiFrame.setVisible(true);
    }
    
    //implement a table model by extending a class to use
    //the AbstractTableModel
    class ExampleTableModel extends AbstractTableModel{
        
        //Two arrays used for the table data
        String[] columnNames = {"First Name", "Surname", "Country"
                        , "Event", "Place", "Time", "World Record" };
        
        Object[][] data = {
            {"César Cielo", "Filho", "Brazil", "50m freestyle",1 , "21.30", false },
            {"Amaury", "Leveaux", "France", "50m freestyle", 2, "21.45", false },
            {"Alain", "Bernard", "France", "50m freestyle", 3, "21.49", false },
            {"Alain", "Bernard", "France", "100m freestyle", 1, "47.21", false },
            {"Eamon", "Sullivan", "Australia", "100m freestyle", 2, "47.32", false },
            {"Jason", "Lezak", "USA", "100m freestyle", 3, "47.67", false },
            {"César Cielo", "Filho", "Brazil", "100m freestyle", 3, "47.67", false },
            {"Michael", "Phelps", "USA", "200m freestyle", 1, "1:42.96", true },
            {"Park", "Tae-Hwan", "South Korea", "200m freestyle", 2, "1:44.85", false },
            {"Peter", "Vanderkaay", "USA", "200m freestyle", 3, "1:45.14", false },
            {"Park", "Tae-Hwan", "South Korea", "400m freestyle", 1, "3:41.86", false },
            {"Zhang", "Lin", "China", "400m freestyle", 2, "3:42.44", false },
            {"Larsen", "Jensen", "USA", "400m freestyle", 3, "3:42.78", false },
            {"Oussama", "Mellouli", "Tunisia", "1500m freestyle",1 , "14:40.84", false },
            {"Grant", "Hackett", "Australia", "1500m freestyle", 2, "14:41.53", false },
            {"Ryan", "Cochrane", "Canada", "1500m freestyle", 3, "14:42.69", false },
            {"Aaron", "Peirsol", "USA", "100m backstroke", 1, "52.54", true },
            {"Matt", "Grevers", "USA", "100m backstroke", 2, "53.11", false },
            {"Arkady", "Vyatchanin", "Russia", "100m backstroke", 3, "53.18", false },
            {"Hayden", "Stoeckel", "Australia", "100m freestyle", 3, "53.18", false },
            {"Ryan", "Lochte", "USA", "200m backstroke", 1, "1:53.94", true },
            {"Aaron", "Peirsol", "USA", "200m backstroke", 2, "1:54.33", false },
            {"Arkady", "Vyatchanin", "Russia", "200m backstroke", 3, "1:54.93", false },
            {"Kosuke", "Kitajima", "Japan", "100m breaststroke", 1, "58.91", true },
            {"Alexander", "Dale Oen", "Norway", "100m breaststroke", 2, "59.20", false },
            {"Hugues", "Duboscq", "France", "100m breaststroke", 3, "59.37", false }
        };
        
        @Override
        public int getRowCount()
        {
            return data.length;
        }
        
        @Override
        public int getColumnCount()            
        {
            return columnNames.length;
        }
        
        @Override
        public Object getValueAt(int row, int column)
        {        
            return data[row][column];
        }
        
        //Used by the JTable object to set the column names
        @Override
        public String getColumnName(int column) {
            return columnNames[column];
        }
        
        //Used by the JTable object to render different
        //functionality based on the data type
        @Override
        public Class getColumnClass(int c) {
            return getValueAt(0, c).getClass();
        }
        
        @Override
        public boolean isCellEditable(int row, int column)
        {
           if (column == 0 || column == 1)
	   {
	        return false;
	   }
	   else
	   {
		return true;
	   }
        }
        
   
    }       
    
}

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