JTable Freezing/Fixing column headers or rows while scrolling

import java.awt.Dimension;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class TestClass extends javax.swing.JFrame {
    private DefaultTableModel tableModel;
    private javax.swing.JScrollPane jScrollPane;
    private javax.swing.JTable jTable;
 
    public TestClass() {
        jScrollPane = new javax.swing.JScrollPane();
        jTable = new javax.swing.JTable();
        jScrollPane.setViewportView(jTable);
        getContentPane().add(jScrollPane);
     
        setPreferredSize(new Dimension(300,120));  
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
     
        Object[][] data = {{"Item1", "Papaya", "Letus", "Cashew", "Pine"},
                             {"Item2", "Orange", "Carrot", "Pine nut", "Oak"},
                             {"Item3", "Apple", "Pepper", "Pistacho", "Cypress"},
                             {"Item4", "Mango", "Tomato", "Almond", "Cedar"},
                             {"Item5", "Pear", "Romman", "Brazil", "Palm"}};
        Object[] headers = {"Item", "Fruit", "Vegetable", "Nuts", "Tree"};
        tableModel = new DefaultTableModel(data, headers);
        jTable.setModel(tableModel);
     
        jTable.setAutoCreateColumnsFromModel( false );
        for (int i=0; i<jTable.getColumnCount(); i++){
            jTable.getColumnModel().getColumn(i).setMinWidth(100);
        }
        jTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

        jScrollPane.setColumnHeaderView(jTable.getTableHeader());
     
        pack();
    }
 
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TestClass().setVisible(true);
            }
        });
    }
}

See also
JTable freezing/fixing columns when scrolling

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