ColumnExample.java Source code

Introduction

Here is the source code for ColumnExample.java

Source

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;

public class ColumnExample extends JFrame {

    public ColumnExample() {
        super("Abstract Model JTable Test");
        setSize(300, 200);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        DefaultTableModel dtm = new DefaultTableModel(new String[][] { { "1", "2", "3" }, { "4", "5", "6" } },
                new String[] { "Names", "In", "Order" });
        SortingColumnModel scm = new SortingColumnModel();
        JTable jt = new JTable(dtm, scm);
        jt.createDefaultColumnsFromModel();

        JScrollPane jsp = new JScrollPane(jt);
        getContentPane().add(jsp, BorderLayout.CENTER);
    }

    public static void main(String args[]) {
        ColumnExample ce = new ColumnExample();
        ce.setVisible(true);
    }
}

class SortingColumnModel extends DefaultTableColumnModel {

    public void addColumn(TableColumn tc) {
        super.addColumn(tc);
        int newIndex = sortedIndexOf(tc);
        if (newIndex != tc.getModelIndex()) {
            moveColumn(tc.getModelIndex(), newIndex);
        }
    }

    protected int sortedIndexOf(TableColumn tc) {
        // just do a linear search for now
        int stop = getColumnCount();
        String name = tc.getHeaderValue().toString();

        for (int i = 0; i < stop; i++) {
            if (name.compareTo(getColumn(i).getHeaderValue().toString()) <= 0) {
                return i;
            }
        }
        return stop;
    }
}