How to set a tooltip to each column of a JTableHeader in Java?

A JTableHeader is a subclass of JComponent class, When we create a JTable object, the constructor creates a new JTableHeader object to manage the table component's header. A JTable supplies a setTableHeader() method that establishes the table header component's JTableHeader object and a getTableHeader() method that returns a reference to the table header component's JTableHeader object. We can set a tooltip text to each column of a JTableHeader by overriding the getToolTipText() method of JTableHeader class.

Example

import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.table.*; public class JTableHeaderToolTipTest extends JPanel {    private DefaultTableModel dmodel;    private JTable table;    private JScrollPane jsp;    public JTableHeaderToolTipTest() {       setLayout(new BorderLayout());       String[] headers = {"Name", "Age", "Contact Number", "City"};       String[] toolTips = {"Name of Emp", "Age of Emp", "Contact Number of Emp","City of Emp"};       dmodel = new DefaultTableModel(headers, 4);       table = new JTable(dmodel);       ToolTipHeader tooltipHeader = new ToolTipHeader(table.getColumnModel());       tooltipHeader.setToolTipStrings(toolTips);       table.setTableHeader(tooltipHeader);       jsp = new JScrollPane(table);       add(jsp, BorderLayout.CENTER);    }    public static void main(String[] args) {       JFrame frame = new JFrame("JTableHeaderToolTip Test");       frame.getContentPane().add(new JTableHeaderToolTipTest(), BorderLayout.CENTER);       frame.setSize(400, 250);       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       frame.setLocationRelativeTo(null);       frame.setVisible(true);    } } // implementation code to set a tooltip text to each column of JTableHeader class ToolTipHeader extends JTableHeader {    String[] toolTips;    public ToolTipHeader(TableColumnModel model) {       super(model);    }    public String getToolTipText(MouseEvent e) {       int col = columnAtPoint(e.getPoint());       int modelCol = getTable().convertColumnIndexToModel(col);       String retStr;       try {          retStr = toolTips[modelCol];       } catch (NullPointerException ex) {          retStr = "";       } catch (ArrayIndexOutOfBoundsException ex) {          retStr = "";       }       if (retStr.length() < 1) {          retStr = super.getToolTipText(e);       }       return retStr;    }    public void setToolTipStrings(String[] toolTips) {       this.toolTips = toolTips;    } }

Output