Here you can find the source of createPanel(LayoutManager layout, Component... components)
public static JPanel createPanel(LayoutManager layout, Component... components)
//package com.java2s; /*//from w ww.j a v a 2 s .c om * 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 JPanel createPanel(Component... components) { return createPanel(new FlowLayout(FlowLayout.CENTER), components); } public static JPanel createPanel(LayoutManager layout, Component... components) { JPanel panel = new JPanel(layout); for (Component comp : components) { panel.add(comp); } return panel; } }