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Multiline Table (2)

Qunfeng Wang
Ranch Hand

Joined: Jan 28, 2005
Posts: 434
Now I achive this purpose.Below is my code.Still hava some problem,When table first appeared, it has an ugly display.Would you run my program and tell me why?

import javax.swing.*;
import java.awt.*;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;

* This cell render can display multi line when the content is too long.
* To use this class you set your table's default cell render to this,
* like that:
* table.setDefaultCellRender(new MultiLineCellRender());
* It still has some bug.When the table first display,it looks urgly.
* Later I will solve this problem.
public class MultiLineCellRenderer
extends JTextArea
implements TableCellRenderer {

public int rowheight;

MultiLineCellRenderer() {
rowheight = this.getRowHeight();

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

int height;
TableModel model = table.getModel();
int rowCount = model.getRowCount();
int columnCount = model.getColumnCount();

//setRowHeight to each row.This is an ugly algorothem,
//especialy "6",it's a magic number I use it present a letter's width
// need a smart one here
for (int i = 0; i < rowCount; i++) {
int max = 0;
for (int j = 0; j < columnCount; j++) {
int rows = table.getModel().getValueAt(0, i).toString().length() * 6 /
table.getColumn(table.getColumnName(i)).getWidth() + 1;
height = this.rowheight * rows;
if (max < height) {
max = height;
table.setRowHeight(i, max);

//setBorder( UIManager.getBorder("TableHeader.cellBorder") );
return this;

//This is main class to run
* is a 1.4 application that requires no other files.

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JTextArea;

* TableDemo is just like SimpleTableDemo, except that it
* uses a custom TableModel.
public class TableDemo extends JPanel {
private boolean DEBUG = false;
int max = 0;
JTextArea t;
int height;

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

JTable table = new JTable(new MyTableModel());
table.setPreferredScrollableViewportSize(new Dimension(500, 70));

//change default cell render to MutiLineCellRenderer
MultiLineCellRenderer cellrender = new MultiLineCellRenderer();

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

//Add the scroll pane to this panel.

class MyTableModel extends AbstractTableModel {
private String[] columnNames = {"First Name",
"Last Name",
"# of Years",
private Object[][] data = {
{" is a 1.4 application that requires these files:", "Knitting",
"TableDialogEditDemo", new Integer(20), new Boolean(true)},
{"Alison", "Huml",
"Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath",
"Knitting", new Integer(2), new Boolean(false)},
{"Sharon", "Zakhour",
"Speed reading", new Integer(20), new Boolean(true)},
{"Philip", "Milne",
"Pool", new Integer(10), new Boolean(true)}

public int getColumnCount() {
return columnNames.length;

public int getRowCount() {
return data.length;

public String getColumnName(int col) {
return columnNames[col];

public Object getValueAt(int row, int col) {
return data[row][col];

* JTable uses this method to determine the default renderer/
* editor for each cell. If we didn't implement this method,
* then the last column would contain text ("true"/"false"),
* rather than a check box.
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();

* Don't need to implement this method unless your table's
* editable.
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 2) {
return false;
} else {
return true;

* Don't need to implement this method unless your table's
* data can change.
public void setValueAt(Object value, int row, int col) {
if (DEBUG) {
System.out.println("Setting value at " + row + "," + col
+ " to " + value
+ " (an instance of "
+ value.getClass() + ")");

data[row][col] = value;
fireTableCellUpdated(row, col);

if (DEBUG) {
System.out.println("New value of data:");

private void printDebugData() {
int numRows = getRowCount();
int numCols = getColumnCount();

for (int i=0; i < numRows; i++) {
System.out.print(" row " + i + ":");
for (int j=0; j < numCols; j++) {
System.out.print(" " + data[i][j]);

* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {
//Make sure we have nice window decorations.

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

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

//Display the window.

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

To be or not to be. It's a question.
Suman Mummaneni
Ranch Hand

Joined: Dec 14, 2004
Posts: 89

hey your code works fine on my system
on java v1.4.2_07 I also changed the look and feel to system look and feel it works fine form no problem in the table and the first 3 cells are non editable as you have set them

Suman Mummaneni
Qunfeng Wang
Ranch Hand

Joined: Jan 28, 2005
Posts: 434
It's a bug of "1.4.2_01"?
But I still think I use setRowHeight not smartly.
Definitly there is a way to resolve it.
I agree. Here's the link:
subject: Multiline Table (2)
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