How to Create a JTable Inside Another JTable In Java Netbeans
In this Java Tutorial we will see How To Create a JTable With a column containing nested tables representing sons and their ages In Netbeans.
What We Are Gonna Use In This Project:
- Java Programming Language.- NetBeans Editor.
- FlatLaf (optional - a modern open-source cross-platform Look and Feel for Java Swing).
What This Project Do:
To visualize the nested tables within the main table, custom cell renderers (NestedTableRenderer) and editors (NestedTableEditor) are implemented.The NestedTableRenderer renders the cell with a JScrollPane containing a nested JTable when applicable, while the NestedTableEditor provides a JScrollPane with an editable nested JTable when editing is initiated.
Project Source Code:
package new_tutorials;
import java.awt.Component;
import javax.swing.AbstractCellEditor;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableModel;
import com.formdev.flatlaf.FlatDarculaLaf;
import javax.swing.UIManager;
/**
*
* @author 1BestCsharp
*/
public class Nested_JTable_Form extends JFrame {
public Nested_JTable_Form(){
setTitle("Nested JTable");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600,600);
setLocationRelativeTo(null);
/*
try{ UIManager.setLookAndFeel(new FlatDarculaLaf()); }
catch(Exception ex){ System.err.println(ex.getMessage()); }
*/
initializeGUI();
}
private void initializeGUI(){
JTable table = new JTable(new ParentTableModel());
table.setRowHeight(100);
table.setShowHorizontalLines(true);
table.setShowVerticalLines(true);
table.getColumnModel().getColumn(2).setCellRenderer(new NestedTableRenderer());
table.getColumnModel().getColumn(2).setCellEditor(new NestedTableEditor());
JScrollPane scrollPane = new JScrollPane(table);
add(scrollPane);
}
public static void main(String[] args) {
new Nested_JTable_Form().setVisible(true);
}
// Define the main table model
private class ParentTableModel extends AbstractTableModel{
private final String[] columnNames = {"Name","Age","Sons"};
private final Object[][] data = {
{"John", 30, createSonTableModel("Son1", "Son2")},
{"Jane", 25, createSonTableModel("Son3", "Son4", "Son5")},
{"Michael", 35, createSonTableModel("Son6")},
{"Emily", 28, createSonTableModel("Son7", "Son8")},
{"Robert", 42, createSonTableModel("Son9", "Son10", "Son11","Son9", "Son10", "Son11","Son9", "Son10", "Son11")},
{"John", 30, createSonTableModel("Son1", "Son2")},
{"Jane", 25, createSonTableModel("Son3", "Son4", "Son5")},
{"Michael", 35, createSonTableModel("Son6")},
{"Emily", 28, createSonTableModel("Son7", "Son8")},
{"Robert", 42, createSonTableModel("Son9", "Son10", "Son11","Son9", "Son10", "Son11","Son9", "Son10", "Son11")}
};
@Override
public int getRowCount() { return data.length; }
@Override
public int getColumnCount() { return columnNames.length; }
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}
@Override
public String getColumnName(int columnIndex){
return columnNames[columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex){
return columnIndex == 2;
}
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex){
data[rowIndex][columnIndex] = value;
fireTableCellUpdated(rowIndex, columnIndex);
}
private SonTableModel createSonTableModel(String... sons){
return new SonTableModel(sons);
}
}
// Define the nested table model for sons
private class SonTableModel extends AbstractTableModel{
private final String[] columnNames = {"Name","Age"};
private final Object[][] data;
// The String... sons parameter allows you to pass an array of String arguments
// or simply a comma-separated list of String values.
public SonTableModel(String... sons){
// Populate the nested table with son data
data = new Object[sons.length][columnNames.length];
for(int i = 0; i < sons.length; i++){
data[i][0] = sons[i];
data[i][1] = (int)(Math.random() * 10 + 1);// Random age
}
}
@Override
public int getRowCount() { return data.length; }
@Override
public int getColumnCount() { return columnNames.length; }
@Override
public String getColumnName(int columnIndex){
return columnNames[columnIndex];
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return data[rowIndex][columnIndex];
}
@Override
public boolean isCellEditable(int rowIndex, int columnIndex)
{
return false;
}
}
// Define the cell renderer for the nested table
private class NestedTableRenderer extends DefaultTableCellRenderer{
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column){
// Create and format the nested table
if(value instanceof TableModel tableModel)
{
JTable nestedJTable = new JTable(tableModel);
nestedJTable.setRowHeight(20);
nestedJTable.setShowHorizontalLines(true);
nestedJTable.setShowVerticalLines(true);
return new JScrollPane(nestedJTable);
}
else
{
// Return the default cell renderer component
return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
}
}
}
// Define the cell editor for the nested table
private class NestedTableEditor extends AbstractCellEditor implements TableCellEditor{
private final JScrollPane scrollPane;
private final JTable nestedJTable;
public NestedTableEditor()
{
// Create the initial nested table and scroll pane
nestedJTable = new JTable(new SonTableModel());
nestedJTable.setRowHeight(20);
nestedJTable.setShowHorizontalLines(true);
nestedJTable.setShowVerticalLines(true);
scrollPane = new JScrollPane(nestedJTable);
}
@Override // Return the model of the nested table
public Object getCellEditorValue() { return nestedJTable.getModel(); }
@Override
public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) {
// Update the nested table model with the current value
if(value instanceof TableModel){
nestedJTable.setModel((SonTableModel)value);
}
return scrollPane;
}
}
}
The Final Result:
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