How to Count Number of Rows and Columns of a JTable

In this tutorial, we are going to see how to count the number of rows and columns of a JTable. To count the number of rows in a JTable, use the method getRowCount(): table.getRowCount(). To count the number of columns in a JTable, use the method getColumnCount(): table.getColumnCount(). Here is an example to count the number of rows and columns of a JTable.

 

Java Program to Count Number of Rows and Columns of a JTable:

import javax.swing.*;
import java.awt.*;
import javax.swing.table.TableColumnModel;
 
public class Main {
 
    public static void main(String[] args) {
        //create a frame
        final JFrame frame = new JFrame("Exemple de JTable");
 
        //JTable Headers 
        String[] columns = new String[] {
            "Id",
            "Name", 
            "Address", 
            "Hourly rate", 
            "Part time"
        };

        //data for JTable in a 2D table
        Object[][] data = new Object[][] {
            {1, "Thomas", "Alaska", 20.0, true },
            {2, "Jean", "Arizona", 50.0, false },
            {3, "Yohan", "California", 30.0, true },
            {4, "Emily", "Florida", 60.0, false },
            {5, "Alex", "New York", 10.0, false },
        };
 
        //create a JTable with data
        JTable table = new JTable(data, columns);
    
    
        JScrollPane scroll = new JScrollPane(table);
        table.setFillsViewportHeight(true);
    
        //add table to frame
        frame.getContentPane().add(scroll);
    
        System.out.println("Number of lines = "+table.getRowCount());
        System.out.println("Number of columns = "+table.getColumnCount());
 
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 180);
        frame.setVisible(true);
    }
}

Output:

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