JTable sort by clicking column header

Sample code for sorting a column by clicking the column header.

import java.awt.Dimension;
import java.util.Comparator;
import java.util.Vector;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableRowSorter;
public class TestClass extends javax.swing.JFrame {
    private DefaultTableModel tableModel;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
 
    public TestClass() {
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jScrollPane1.setViewportView(jTable1);
        getContentPane().add(jScrollPane1);
     
        setPreferredSize(new Dimension(500,300));  
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        pack();
     
        Object[] headers = {"Item", "Fruit"};
        tableModel = new DefaultTableModel();
        tableModel.setColumnIdentifiers(headers);
        Vector row1 = new Vector();
        row1.add("Item1");
        row1.add("Papaya");
        Vector row2 = new Vector();
        row2.add("Item2");
        row2.add("Orange");
        Vector row3 = new Vector();
        row3.add("Item3");
        row3.add("Apple");
        tableModel.addRow(row1);
        tableModel.addRow(row2);
        tableModel.addRow(row3);
     
        jTable1.setModel(tableModel);
     
        jTable1.setAutoCreateRowSorter(true);
        TableRowSorter<DefaultTableModel> sorter = new TableRowSorter<DefaultTableModel>(tableModel);
        sorter.setComparator(1, new SorterComparator<String>());
        jTable1.setRowSorter(sorter);
    }
 
    private class SorterComparator<E> implements Comparator {
        public int compare(Object s1, Object s2){
            return ((String)s1).compareTo((String)s2);
        }
    }
 
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TestClass().setVisible(true);
            }
        });
    }
}

Further Readings:
1. JTable sort the content of a column

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