Java SE (Java Platform, Standard Edition)

CODE

import java.awt.Component;
import javax.swing.*;
import javax.swing.table.TableCellRenderer;
import java.awt.event.MouseEvent;
import java.awt.event.AdjustmentListener;
import java.awt.event.AdjustmentEvent;
import javax.swing.ToolTipManager;

public class TooltipsAndScrollPane {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        TableCellRenderer renderer = new TableCellRenderer() {
            JLabel label = new JLabel();

            public Component getTableCellRendererComponent(
                    JTable table, Object value,
                    boolean isSelected, boolean hasFocus,
                    int row, int column) {
                label.setToolTipText("(" + row+ "," + column + ")");
                return label;
            }

        };

        final JTable table = new JTable(50,50);
        for(int i = 0; i < table.getColumnCount(); i++) {
            table.getColumnModel().getColumn(i).setCellRenderer(renderer);
        }


        JScrollPane scroller = new JScrollPane(table);
        //uncomment for solution
        /*
        scroller.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener() {
            public void adjustmentValueChanged(AdjustmentEvent e) {
              java.awt.Point p = table.getMousePosition();
                if(p != null) {
                    MouseEvent phantom = new MouseEvent(
                            table,MouseEvent.MOUSE_MOVED,
                            System.currentTimeMillis(),0,p.x,p.y,1,false);
                    ToolTipManager.sharedInstance().mouseMoved(phantom);
                }
            }
        });
        */
        
        JFrame frame = new JFrame();
        frame.add(scroller);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300,300);
        frame.setVisible(true);
    }
}