Sparsely Populated Table Model : JTable Model « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JTable Model

import java.awt.BorderLayout;
import java.awt.Point;
import java.util.HashMap;
import java.util.Map;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;

class SparseTableModel extends AbstractTableModel {

  private Map<Point, Object> lookup;

  private final int rows;

  private final int columns;

  private final String headers[];

  public SparseTableModel(int rows, String columnHeaders[]) {

    this.rows = rows;
    this.columns = columnHeaders.length;
    headers = columnHeaders;
    lookup = new HashMap<Point, Object>();
  }

  public int getColumnCount() {
    return columns;
  }

  public int getRowCount() {
    return rows;
  }

  public String getColumnName(int column) {
    return headers[column];
  }

  public Object getValueAt(int row, int column) {
    return lookup.get(new Point(row, column));
  }

  public void setValueAt(Object value, int row, int column) {
    if ((rows < 0) || (columns < 0)) {
      throw new IllegalArgumentException("Invalid row/column setting");
    }
    if ((row < rows) && (column < columns)) {
      lookup.put(new Point(row, column), value);
    }
  }
}

public class SparseTableModelDemo {
  public static void main(String[] a) {

    String headers[] = { "A", "B" };
    TableModel model = new SparseTableModel(10, headers);
    JTable table = new JTable(model);
    model.setValueAt("1", 0, 0);
    model.setValueAt("2", 9, 0);
    model.setValueAt("3", 5, 1);
    model.setValueAt("4", 8, 1);

    JFrame frame = new JFrame("Fixed Column Table");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.add(new JScrollPane(table), BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}

14.59.JTable Model
	14.59.1.	Create DefaultTableModel
	14.59.2.	Creating simple JTable using AbstractTableModel
	14.59.3.	Extending AbstractTableModel
	14.59.4.	Creates tables that allow rows and columns to be added or deleted
	14.59.5.	Set table value
	14.59.6.	Add logic to get value method
	14.59.7.	Subclass AbstractTableModel to reuse an existing data structure: Treat an array as an AbstractTableModel
	14.59.8.	Sparsely Populated Table Model
	14.59.9.	Listening to JTable Events with a TableColumnModelListener
	14.59.10.	The Calendar program.
	14.59.11.	Sample Sorting Table Model
	14.59.12.	Add columns to a table through DefaultTableModel
	14.59.13.	Insert a row to a table through DefaultTableModel
	14.59.14.	Insert a row to a table through DefaultTableModel at specified row
	14.59.15.	Append a row to a table through DefaultTableModel at specified row
	14.59.16.	Remove the first row from a table with DefaultTableModel
	14.59.17.	Remove the last row from a table with DefaultTableModel
	14.59.18.	Move the first row to the end of the table
	14.59.19.	Move the first two rows to the end of the table
	14.59.20.	Move the last two rows to the start of the table
	14.59.21.	Move the last row to the beginning of the table
	14.59.22.	Get all the table data from DefaultTableModel
	14.59.23.	Copy (clone) the data from the second row
	14.59.24.	Overwrite the date from the first row with DefaultTableModel
	14.59.25.	Add rows to a Table
	14.59.26.	Sharing a Table Model Between JTable Components
	14.59.27.	Disabling User Edits in a JTable with DefaultTableModel
	14.59.28.	Appending a Row to a JTable Component
	14.59.29.	Copy data from a table to a list
	14.59.30.	Map TableModel
	14.59.31.	Bean Property Table Model