Here you can find the source of growFont(JComponent button)
public static void growFont(JComponent button)
//package com.java2s; /*//from w w w . ja va 2 s. c o m * CS 106A * * This instructor-provided file contains utility functions related to GUIs. * * Author : Marty Stepp * Version: Tue 2014/06/05 * * This file and its contents are copyright (C) Stanford University and Marty Stepp, * licensed under Creative Commons Attribution 2.5 License. All rights reserved. */ import java.awt.*; import javax.swing.*; public class Main { public static void growFont(JComponent button) { growFont(button, 1); } public static void growFont(JComponent button, int amount) { Font font = button.getFont(); font = font.deriveFont((float) (font.getSize() + amount)); button.setFont(font); } }