使用 Dimension 将 JFrame 最大化为屏幕大小答案

【问题标题】：JFrame maximized to screen size with Dimension使用 Dimension 将 JFrame 最大化为屏幕大小
【发布时间】：2018-02-15 15:24:52
【问题描述】：

我能想到的只是我没有正确设置屏幕尺寸。日志显示高度和宽度看起来正确。来自Swing trail：

package net.bounceme.dur.nntp.swing;

import java.awt.Dimension;
import java.awt.Toolkit;
import java.util.logging.Logger;
import javax.swing.*;
import java.awt.*;

public class HelloWorldSwing {

    private static final Logger LOG = Logger.getLogger(HelloWorldSwing.class.getName());

    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


       // Container c = frame.getContentPane();
//        frame.getContentPane();
      //  c.setBackground(Color.YELLOW);
        // adjust to need.
        Dimension d = new Dimension(400, 40);
        //c.setPreferredSize(d);

        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);

        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        int height = screenSize.height - 50;
        int width = screenSize.width - 50;
        frame.setSize(height, width);
        frame.setSize(d);
        LOG.info(height + "\t\t\t" + width);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                createAndShowGUI();
            }
        });
    }
}

强制性法律样板：

/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

/**
 * This example, like all Swing examples, exists in a package:
 * in this case, the "start" package.
 * If you are using an IDE, such as NetBeans, this should work 
 * seamlessly.  If you are compiling and running the examples
 * from the command-line, this may be confusing if you aren't
 * used to using named packages.  In most cases,
 * the quick and dirty solution is to delete or comment out
 * the "package" line from all the source files and the code
 * should work as expected.  For an explanation of how to
 * use the Swing examples as-is from the command line, see
 * http://docs.oracle.com/javase/javatutorials/tutorial/uiswing/start/compile.html#package
 */

截图：

【问题讨论】：

是的，我设置了两次大小。我都试过了，都没有给我一个更大的 JFrame。
你的 JFrame 看起来怎么样？没有包围整个屏幕？
不，它很小：www.zimagez.com/zimage/screenshot-03282013-013904am.php

标签： java swing jframe fullscreen dimension

【解决方案1】：

尝试删除frame.pack();。这给出了扩展的框架。这是因为 pack() 导致帧为re-sized。

【讨论】：

@Thufir: 不要删除 pack(); 在调整框架大小之前执行此操作。也可以考虑setExtendedState()。
@trashgod 你说得对，如果pack() 在调整大小之前被移动，则此事件有效。
@Apurv：是的，但是容器层次结构中的其他组件可能需要打包。

【解决方案2】：

Toolkit.getDefaultToolkit().getScreenSize() 不考虑任务/停靠栏之类的任何其他插入内容
您正在调用 JFrame#pack，它将调整框架的大小以适应其内容的首选大小

你应该使用JFrame#setExtendedState(JFrame.MAXIMIZED_BOTH)

【讨论】：

我稍后再看，但我似乎没有 JFrame.setExtendedSize() ...？我这边出错了？
是的，应该设置ExtendedState

【解决方案3】：

您应该在代码中注释此行：

//frame.setSize(d);

同时删除这一行：

//frame.pack();

【讨论】：

【解决方案4】：

删除pack() 调用。并尝试将setSize()、setPrefferredSize() 和setMaximumSize() 这三种方法设置为相同的维度。

【讨论】：

【解决方案5】：

试试这个，

this.setExtendedState(MAXIMIZED_BOTH);

【讨论】：

【解决方案6】：

提醒那些刚刚发现这个的人，

frame.setSize(height, width);

倒退了，应该是：

frame.setSize(width, height);

否则当你运行程序时你会很快注意到（除非你有一个方形屏幕）你的 JFrame 不会覆盖你屏幕右侧的一部分。

另外，删除这部分代码以查看 JFrame 尝试占用大部分屏幕（我在 28" 显示器上使用上述代码（没有frame.pack()）获得了大部分屏幕：

frame.setSize(d);

上面的 sn-p 代码将您的 JFrame 更改为在 Dimension d 中定义的宽度 400、高度 40。

【讨论】：