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Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard
There is a newer version: 10.18.1
////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2015 the original author or authors.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

package com.puppycrawl.tools.checkstyle.gui;

import java.awt.EventQueue;
import java.io.File;

import javax.swing.JFrame;
import javax.swing.WindowConstants;

import com.puppycrawl.tools.checkstyle.api.DetailAST;

/**
 * Entry point for starting the checkstyle GUI.
 *
 * @author unknown
 */
public final class Main {

    /** Frame's name. */
    private static final String FRAME_NAME = "CheckStyle";

    /** Main frame. */
    private static JFrame frame;

    /** Hidden constructor of the current utility class. */
    private Main() {
        // no code
    }

    /**
     * Entry point.
     * @param args the command line arguments.
     */
    public static void main(String... args) {
        frame = new JFrame(FRAME_NAME);
        final ParseTreeInfoPanel panel = new ParseTreeInfoPanel();
        frame.getContentPane().add(panel);
        if (args.length >= 1) {
            final File file = new File(args[0]);
            panel.openFile(file, frame);
        }
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        final Runnable runner = new FrameShower(frame);
        EventQueue.invokeLater(runner);
    }

    /**
     * Method is used for testing in the past.
     * @param ast tree to display
     */
    public static void displayAst(DetailAST ast) {
        final JFrame testFrame = new JFrame(FRAME_NAME);
        final ParseTreeInfoPanel panel = new ParseTreeInfoPanel();
        testFrame.getContentPane().add(panel);
        panel.openAst(ast);
        testFrame.setSize(1500, 800);
        testFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        testFrame.setVisible(true);
    }

    /**
     * @return Main GUI's frame.
     */
    static JFrame getFrame() {
        return frame;
    }

    /**
     * Http://findbugs.sourceforge.net/bugDescriptions.html#SW_SWING_METHODS_INVOKED_IN_SWING_THREAD
     */
    private static class FrameShower implements Runnable {
        /**
         * Frame.
         */
        private final JFrame frame;

        /**
         * @param frame JFrame component.
         */
        FrameShower(JFrame frame) {
            this.frame = frame;
        }

        /**
         * Display a frame.
         */
        @Override
        public void run() {
            frame.pack();
            frame.setVisible(true);
        }
    }
}