blocks|key|4344509|text|根据完成时间的不同，在程序启动后设置该属性可能会太晚而不起作用。相反，应在启动时添加设置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4344510|java+-Dapple.laf.useScreenMenuBar=true+-jar+MyApplication.jar|code-block|syntax|javascript|4344511|或者，按照、、和中的讨论，在应用程序包的Info.plist中设置该属性。|offset|length|style|CODE|4344512|<key>Properties</key>
<dict>
++++<key>apple.laf.useScreenMenuBar</key>
++++<string>true</string>
++++...
</dict>|4344513|附录:如下所示，使用@Urs+Reupke或我自己建议的方法不会出现问题。您(丢失的)+DesktopMain可能有问题。|4344514|​|4344515|📷|atomic|4344516|4344517|import+java.awt.Color;
import+java.awt.Dimension;
import+java.awt.EventQueue;
import+javax.swing.BorderFactory;
import+javax.swing.JFrame;
import+javax.swing.JMenu;
import+javax.swing.JMenuBar;
import+javax.swing.JPanel;

/**+@see+http://stackoverflow.com/questions/8955638+*/
public+class+NewMain+{

++++public+static+void+main(String[]+args)+{
++++++++System.setProperty("apple.laf.useScreenMenuBar",+"true");
++++++++System.setProperty(
++++++++++++"com.apple.mrj.application.apple.menu.about.name",+"Name");
++++++++EventQueue.invokeLater(new+Runnable()+{

++++++++++++@Override
++++++++++++public+void+run()+{

++++++++++++++++JFrame+frame+=+new+JFrame("Gabby");
++++++++++++++++final+JPanel+dm+=+new+JPanel()+{

++++++++++++++++++++@Override
++++++++++++++++++++public+Dimension+getPreferredSize()+{
++++++++++++++++++++++++return+new+Dimension(320,+240);
++++++++++++++++++++}
++++++++++++++++};
++++++++++++++++dm.setBorder(BorderFactory.createLineBorder(Color.blue,+10));

++++++++++++++++frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
++++++++++++++++frame.add(dm);
++++++++++++++++frame.pack();
++++++++++++++++frame.setLocationByPlatform(true);

++++++++++++++++JMenuBar+menuBar+=+new+JMenuBar();
++++++++++++++++JMenu+fileMenu+=+new+JMenu("File");
++++++++++++++++menuBar.add(fileMenu);
++++++++++++++++frame.setJMenuBar(menuBar);
++++++++++++++++frame.setVisible(true);
++++++++++++}
++++++++});
++++}
}|4344518|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e6f74050c41a68fdbd1babe47924c0f9.png|imageAlt^0|0|0|K|A|0|0|18|B|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|19|8|@$I|1A|J|1B|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|1C|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1D|8|@$I|1E|J|1F|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1G|8|@]|9|@]|A|$]]|$1|S|3|T|5|U|7|1H|8|@]|9|@$I|1I|J|1J|1|1K]]|A|$]]|$1|V|3|R|5|6|7|1L|8|@]|9|@]|A|$]]|$1|W|3|X|5|D|7|1M|8|@]|9|@]|A|$E|F]]|$1|Y|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15|16|-4]]]]

Depending on when it's done, setting the property after your program launches may be too late to be effective. Instead, add the setting at launch time.

<pre><code>java -Dapple.laf.useScreenMenuBar=true -jar MyApplication.jar
</code></pre>

Alternatively, set the property in your application bundle's <code>Info.plist</code>, as discussed in <a href="https://developer.apple.com/library/mac/#documentation/java/conceptual/java14development/03-javadeployment/javadeployment.html" rel="noreferrer">Java Deployment Options for Mac OS X</a>, <a href="https://developer.apple.com/library/mac/#documentation/java/Reference/Java_InfoplistRef/Articles/JavaDictionaryInfo.plistKeys.html#//apple_ref/doc/uid/TP40001969" rel="noreferrer">Java Dictionary Info.plist Keys</a>, <a href="https://developer.apple.com/library/mac/#documentation/General/Reference/InfoPlistKeyReference/Introduction/Introduction.html" rel="noreferrer">About Info.plist Keys</a> and <a href="https://developer.apple.com/library/mac/documentation/java/Reference/Java_PropertiesRef/Articles/JavaSystemProperties.html" rel="noreferrer">Java Runtime System Properties</a>.

<pre><code>&lt;key&gt;Properties&lt;/key&gt;
&lt;dict&gt;
 &lt;key&gt;apple.laf.useScreenMenuBar&lt;/key&gt;
 &lt;string&gt;true&lt;/string&gt;
 ...
&lt;/dict&gt;
</code></pre>

Addendum: As shown below, the problem does not appear using the approach suggested by @Urs Reupke or myself. Your (missing) <code>DesktopMain</code> may be at fault.

<img src="https://i.stack.imgur.com/isrGQ.png" alt="Screen capture">

<pre><code>import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;

/** @see http://stackoverflow.com/questions/8955638 */
public class NewMain {

 public static void main(String[] args) {
 System.setProperty("apple.laf.useScreenMenuBar", "true");
 System.setProperty(
 "com.apple.mrj.application.apple.menu.about.name", "Name");
 EventQueue.invokeLater(new Runnable() {

 @Override
 public void run() {

 JFrame frame = new JFrame("Gabby");
 final JPanel dm = new JPanel() {

 @Override
 public Dimension getPreferredSize() {
 return new Dimension(320, 240);
 }
 };
 dm.setBorder(BorderFactory.createLineBorder(Color.blue, 10));

 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.add(dm);
 frame.pack();
 frame.setLocationByPlatform(true);

 JMenuBar menuBar = new JMenuBar();
 JMenu fileMenu = new JMenu("File");
 menuBar.add(fileMenu);
 frame.setJMenuBar(menuBar);
 frame.setVisible(true);
 }
 });
 }
}
</code></pre>

blocks|key|304328|text|作为垃圾神建议的另一种选择，做你正在做的事情--但是在初始化你的UI之前，要尽早去做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|304329|此外，您还可以考虑使用此命令在栏中显示应用程序的名称：|304330|++++System.setProperty("com.apple.mrj.application.apple.menu.about.name",+"MyApplication");|code-block|syntax|javascript|304331|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

As an alternative to what trashgod suggests, do what you're doing - but do it very early, before you initialize your UI.

Also, you might consider using this to display your application's name in the bar:

<pre><code> System.setProperty("com.apple.mrj.application.apple.menu.about.name", "MyApplication");
</code></pre>

blocks|key|4344578|text|对于Java+8，请使用以下代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4344579|System.setProperty("apple.awt.application.name",+"My+app");|code-block|syntax|javascript|4344580|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For Java 8 use this

<pre><code>System.setProperty("apple.awt.application.name", "My app");
</code></pre>

blocks|key|4344624|text|我知道这个问题有点老了，但对我有用的是，我创建了一个名为Main的新类，然后将系统属性设置为|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4344625|System.setProperty("apple.laf.useScreenMenuBar",+"true");
System.setProperty("apple.awt.application.name",+"My+app");|code-block|syntax|javascript|4344626|在JDK15中工作。|4344627|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I know this question is old, but what worked for me is I created a new class called Main, and then set the system property like
<pre><code>System.setProperty(&quot;apple.laf.useScreenMenuBar&quot;, &quot;true&quot;);
System.setProperty(&quot;apple.awt.application.name&quot;, &quot;My app&quot;);
</code></pre>
Works in JDK15.

When I move my <code>JMenuBar</code> to the screen menu bar on Mac OS X, it leaves some blank space where the menu would be in my window; I need to remove that space. I am using 

<pre><code>System.setProperty("apple.laf.useScreenMenuBar", "true")
</code></pre>

to move my <code>JMenuBar</code> to the screen menu bar. My friend who uses a Mac reports that this leaves some ugly vertical space where the menu would reside if I did not set that property. What is the best way to resolve this issue?

EDIT: Here is an example from my source:

<pre><code>public static void main(String[] args) {
 System.setProperty("apple.laf.useScreenMenuBar", "true");
 System.setProperty("com.apple.mrj.application.apple.menu.about.name", "Name");

 JFrame frame = new JFrame("Gabby");
 final DesktopMain dm = new DesktopMain();

 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.add(dm);
 frame.setSize(160, 144);
 frame.setLocationRelativeTo(null);
 frame.setIgnoreRepaint(true);

 JMenuBar menuBar = new JMenuBar();
 JMenu fileMenu = new JMenu("File");
 menuBar.add(fileMenu);

 // Populating the menu bar code goes here

 frame.setJMenuBar(menuBar);
 frame.setVisible(true);
}
</code></pre>

How do I move my JMenuBar to the screen menu bar on Mac OS X?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我将我的JMenuBar移动到Mac的屏幕菜单栏上时，它会在我的窗口中留下一些菜单所在的空白区域；我需要删除这些空间。我正在使用System.setProperty("apple.laf.useScreenMenuBar", "true")将我的JMenuBar移到屏幕菜单栏。我的一位使用Mac的朋友报告说，如果我没...

问如何将JMenuBar移动到Mac的屏幕菜单栏？
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