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How to change each column width of a JTable in Java?
JTable
- A JTable is a subclass of JComponent for displaying complex data structures.
- A JTable can follow the Model View Controller (MVC) design pattern for displaying the data in rows and columns.
- The DefaultTableModel class can extend AbstractTableModel and it can be used to add the rows and columns to a JTable dynamically.
- The DefaultTableCellRenderer class can extend JLabel class and it can be used to add images, colored text and etc. inside the JTable cell.
- A JTable can generate TableModelListener, TableColumnModelListener, ListSelectionListener, CellEditorListener, RowSorterListener interfaces.
- By default the width of a JTable is fixed, we can also change the width of each column by using table.getColumnModel().getColumn().setPreferredWidth() method of JTable class.
Example
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
public class JTableTest extends JFrame {
private JTable table;
private JScrollPane scrollPane;
private DefaultTableModel model;
private DefaultTableCellRenderer cellRenderer;
public JTableTest() {
setTitle("JTable Test");
setLayout(new FlowLayout());
scrollPane = new JScrollPane();
JTable table = new JTable();
scrollPane.setViewportView(table);
model = (DefaultTableModel)table.getModel();
model.addColumn("S.No");
model.addColumn("First Name");
model.addColumn("Last Name");
model.addColumn("Email");
model.addColumn("Contact");
for(int i = 0;i < 4; i++) {
model.addRow(new Object[0]);
model.setValueAt(i+1, i, 0);
model.setValueAt("Tutorials", i, 1);
model.setValueAt("Point", i, 2);
model.setValueAt("@tutorialspoint.com", i, 3);
model.setValueAt("123456789", i, 4);
}
// set the column width for each column
table.getColumnModel().getColumn(0).setPreferredWidth(5);
table.getColumnModel().getColumn(3).setPreferredWidth(100);
cellRenderer = new DefaultTableCellRenderer();
cellRenderer.setHorizontalAlignment(JLabel.CENTER);
table.getColumnModel().getColumn(0).setCellRenderer(cellRenderer);
add(scrollPane);
setSize(475, 250);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args) {
new JTableTest();
}
}Output
Updated on: 10-Feb-2020
6K+ Views
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