Here you can find the source of sizeUniformly(JComponent... components)
public static void sizeUniformly(JComponent... components)
//package com.java2s; /*//from w ww. j a va 2 s. c om * pickcal - a calendar picker panel * Copyright 2011-2015 MeBigFatGuy.com * Copyright 2011-2015 Dave Brosius * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and limitations * under the License. */ import java.awt.Dimension; import javax.swing.JComponent; public class Main { public static void sizeUniformly(JComponent... components) { for (JComponent c : components) { c.setPreferredSize(null); c.setMinimumSize(null); c.setMaximumSize(null); } int width = 0; int height = 0; for (JComponent c : components) { Dimension d = c.getPreferredSize(); if (d.width > width) { width = d.width; } if (d.height > height) { height = d.height; } } for (JComponent c : components) { Dimension d = c.getPreferredSize(); d.width = width; d.height = height; c.setPreferredSize(d); c.setMinimumSize(d); c.setMaximumSize(d); } } }