Here you can find the source of getHeaderDimension(JTable table, TableColumn tableColumn)
public static Dimension getHeaderDimension(JTable table, TableColumn tableColumn)
//package com.java2s; /*//from w w w .j a v a 2 s .c o m Copyright 2003-2012 Dmitry Barashev, GanttProject Team This file is part of GanttProject, an opensource project management tool. GanttProject is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GanttProject is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GanttProject. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Component; import java.awt.Dimension; import javax.swing.JTable; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumn; public class Main { public static Dimension getHeaderDimension(JTable table, TableColumn tableColumn) { TableCellRenderer renderer = tableColumn.getHeaderRenderer(); if (renderer == null) { renderer = table.getTableHeader().getDefaultRenderer(); } Component comp = renderer.getTableCellRendererComponent(table, tableColumn.getHeaderValue(), false, false, 0, 0); return comp.getPreferredSize(); } }