Here you can find the source of packColumn(JTable table, int vColIndex, int margin)
public static void packColumn(JTable table, int vColIndex, int margin)
//package com.java2s; //License from project: Open Source License import java.awt.Component; import javax.swing.JTable; import javax.swing.table.DefaultTableColumnModel; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumn; public class Main { public static void packColumn(JTable table, int vColIndex, int margin) { DefaultTableColumnModel colModel = (DefaultTableColumnModel) table.getColumnModel(); TableColumn col = colModel.getColumn(vColIndex); int width = 0; // Get width of column header TableCellRenderer renderer = col.getHeaderRenderer(); if (renderer == null) { renderer = table.getTableHeader().getDefaultRenderer(); }//w w w . j ava 2s . c o m Component comp = renderer.getTableCellRendererComponent(table, col.getHeaderValue(), false, false, 0, 0); width = comp.getPreferredSize().width; // Get maximum width of column data for (int r = 0; r < table.getRowCount(); r++) { renderer = table.getCellRenderer(r, vColIndex); comp = renderer.getTableCellRendererComponent(table, table.getValueAt(r, vColIndex), false, false, r, vColIndex); width = Math.max(width, comp.getPreferredSize().width); } // Add margin width += 2 * margin; // Set the width col.setPreferredWidth(width); } }