Java tutorial
import java.awt.Component; import javax.swing.JComponent; import javax.swing.JTable; import javax.swing.table.TableCellRenderer; public class Main { public static void main(String[] argv) throws Exception { JTable table = new JTable() { public Component prepareRenderer(TableCellRenderer renderer, int rowIndex, int vColIndex) { Component c = super.prepareRenderer(renderer, rowIndex, vColIndex); if (c instanceof JComponent) { JComponent jc = (JComponent) c; jc.setToolTipText((String) getValueAt(rowIndex, vColIndex)); } return c; } }; } }