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JAVA JTable Merge cells

The following code mimics the merge cells effect on the first column. The first column has multiple line.

//All copyright reserved by
//No redistribution is allowed without author permmision and a back link to
// Example from
// is not responsible for your data loss or any damage.

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.table.*;
import javax.swing.*;
import java.awt.Color ;
import java.awt.Component;
import java.util.StringTokenizer;
class myCellRenderer extends JTextArea implements TableCellRenderer

public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,int row, int column)

setBackground(table.getSelectionBackground() );
setBackground(Color.white );
//set column height
String stmp;
StringTokenizer st;
int rowHight=table.getRowHeight() +table.getRowMargin()+1;
int fold;

st=new StringTokenizer (stmp,"\n");
fold=st.countTokens ();
if(table.getRowHeight(row)!=fold*rowHight) /
table.setRowHeight(row, fold*rowHight);

return this;
public class MergeCells extends JPanel {
private boolean DEBUG = false;

public MergeCells() {
super(new GridLayout(1,0));

String[] columnNames = {"Persons", "Class"};

Object[][] data = {
{"HugoJone \n Sep Dion \n Tom Saw\n Saron Xie",
{"Harry Potter\n Alice Petty",
{"Tom Sawyer",
{"AliceWonder\n Taylor Emo \nJim Setty \n Emi learn ",

final JTable table = new JTable(data, columnNames);
table.setPreferredScrollableViewportSize(new Dimension(500, 70));
int cols = table.getColumnCount();
myCellRenderer mcr=new myCellRenderer ();
TableColumn column;
int i;

//set first column multiple line

//Create the scroll pane and add the table to it.
JScrollPane scrollPane = new JScrollPane(table);

//Add the scroll pane to this panel.

public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.

//Create and set up the window.
JFrame frame = new JFrame("SimpleTableDemo");

//Create and set up the content pane.
MergeCells newContentPane = new MergeCells();
newContentPane.setOpaque(true); //content panes must be opaque

//Display the window.


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Best books about JAVA programming from Amazon
Professional Java, JDK 5 Edition (Paperback Simply Java Programming: An Application-Driven Tutorial Approach (Paperback) Effective Java Programming Language Guide (Paperback) Head First Java, 2nd Edition (Paperback) Java : An Introduction to Problem Solving and Programming (4th Edition)


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