blocks|key|753556|text|Java有点笨拙，但是没有什么比检查源代码来获得答案更好的了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|753557|请注意，MetalLookAndFeel和Nimbus是不同的实现，每个实现的属性不必相同。|753558|下面的示例使用MetalLookAndFeel。|753559|package+com.stackoverflow.laf.font;

import+java.awt.Font;

import+javax.swing.JFrame;
import+javax.swing.JLabel;
import+javax.swing.SwingUtilities;
import+javax.swing.UIManager;

public+class+SetFontExample+{

++public+static+void+main(String[]+args)+{

++++SwingUtilities.invokeLater(new+Runnable()+{
++++++@Override+public+void+run()+{
++++++++UIManager.put("Label.font",+new+Font(Font.SANS_SERIF,+0,+20));
++++++++try+{
++++++++++UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
++++++++}+catch+(Exception+e)+{
++++++++++e.printStackTrace();
++++++++}

++++++++JFrame+frame+=+new+JFrame("Set+font+example");
++++++++frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
++++++++frame.add(new+JLabel("Font+test"));
++++++++frame.pack();
++++++++frame.setVisible(true);
++++++}
++++});
++}
}|code-block|syntax|javascript|753560|这是因为"Label.font“属性存在于金属上，并且它正确地使用了该属性。|753561|你可以这样检查：|753562|package+com.stackoverflow.laf;

import+javax.swing.SwingUtilities;
import+javax.swing.UIDefaults;
import+javax.swing.UIManager;

public+class+ListLAFUIDefaults+{

++public+static+void+main(String[]+args)+{
++++SwingUtilities.invokeLater(new+Runnable()+{
++++++@Override+public+void+run()+{
++++++++try+{
++++++++++//+Choose+LAF
++++++++++UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
++++++++}+catch+(Exception+e)+{
++++++++++e.printStackTrace();
++++++++}
++++++++UIDefaults+defaults+=+UIManager.getLookAndFeel().getDefaults();
++++++++System.out.println(defaults);

++++++++//+Check+a+property
++++++++String+propertyKey+=+"defaultFont";
++++++++System.out.println(UIManager.getLookAndFeel().getName()+%2B
++++++++++++(defaults.containsKey(propertyKey)+?+"+contains+"+:+"+doesn't+contain+")+%2B
++++++++++++"property+"+%2B+propertyKey);
++++++}
++++});
++}
}|753563|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|H|7|Y|8|@]|9|@]|A|$I|J]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

Java LAF API is a little bit clumsy, but there is nothing better than check the source code to get your answers.

Note that MetalLookAndFeel and Nimbus are different implementations and the properties for each one doesn't have to be the same.

The following examples use the MetalLookAndFeel.

<pre><code>package com.stackoverflow.laf.font;

import java.awt.Font;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class SetFontExample {

 public static void main(String[] args) {

 SwingUtilities.invokeLater(new Runnable() {
 @Override public void run() {
 UIManager.put("Label.font", new Font(Font.SANS_SERIF, 0, 20));
 try {
 UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
 } catch (Exception e) {
 e.printStackTrace();
 }

 JFrame frame = new JFrame("Set font example");
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.add(new JLabel("Font test"));
 frame.pack();
 frame.setVisible(true);
 }
 });
 }
}
</code></pre>

This works because the property "Label.font" exists on Metal and it uses that property correctly.

You you can check it this way:

<pre><code>package com.stackoverflow.laf;

import javax.swing.SwingUtilities;
import javax.swing.UIDefaults;
import javax.swing.UIManager;

public class ListLAFUIDefaults {

 public static void main(String[] args) {
 SwingUtilities.invokeLater(new Runnable() {
 @Override public void run() {
 try {
 // Choose LAF
 UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
 } catch (Exception e) {
 e.printStackTrace();
 }
 UIDefaults defaults = UIManager.getLookAndFeel().getDefaults();
 System.out.println(defaults);

 // Check a property
 String propertyKey = "defaultFont";
 System.out.println(UIManager.getLookAndFeel().getName() +
 (defaults.containsKey(propertyKey) ? " contains " : " doesn't contain ") +
 "property " + propertyKey);
 }
 });
 }
}
</code></pre>

blocks|key|2278143|text|今天令我惊讶的是，LaF设置器setFont、setBackground等实际上并没有设置真实的属性。规范说，LaFs可以忽略用户设置的字体、颜色等。这就是为什么GTKLaF被完全破坏的原因。它使用的是系统gtk主题设置，而不是程序员的设置。IIRC有一个单独的包私有类，它包含默认值(NimbusDefaults?)而且很难被访问。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2278144|我建议不要使用GTK或Nimbus+LAF，如果您计划以任何方式定制外观。|2278145|一个快速的google搜索显示了这的GTK|offset|length|2278146|在这里中可以找到对这些问题的讨论。|2278147|entityMap|0|LINK|mutability|MUTABLE|url|http://www.dynamicobjects.com/d2r/archives/002316.html|1|http://forums.sun.com/thread.jspa?threadID=5342101^0|0|0|G|1|0|0|1|2|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$F|W|G|X|1|Y]]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$F|10|G|11|1|12]]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

One thing that amazes me to this day is that the LaF setters [setFont, setBackground, etc] do not actually set real properties. The spec says that LaFs are allowed to ignore user set fonts, colors, etc. This is why GTKLaF is completely broken. It uses the system gtk theme settings, not the programmer's settings. IIRC Nimbus has a separate, package private class that contains defaults (NimbusDefaults?) and can't be easily accessed.

I suggest never using GTK or Nimbus LAF if you plan on customizing the look in any way.

A quick google search turns up <a href="http://www.dynamicobjects.com/d2r/archives/002316.html" rel="nofollow noreferrer">this</a> for GTK

A discussion about these problems in nimbus can be found <a href="http://forums.sun.com/thread.jspa?threadID=5342101" rel="nofollow noreferrer">here</a>.

blocks|key|753671|text|用FontUIResource包装字体。我对UIManager颜色也有同样的问题，ColorUIResource修复了所有的东西。在不深入JDK的情况下，我认为有些地方组件期望(阅读:通过instanceof)检查UIResources+(也许有人可以确认这一点)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|753672|entityMap|0|LINK|mutability|MUTABLE|url|http://java.sun.com/javase/6/docs/api/javax/swing/plaf/FontUIResource.html^0|1|E|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Wrap your Font with <a href="http://java.sun.com/javase/6/docs/api/javax/swing/plaf/FontUIResource.html" rel="nofollow noreferrer">FontUIResource</a>. I had the exact same problem with UIManager colors and ColorUIResource fixed everything. Without digging through the JDK, I think there are some places where components expect (read: check via instanceof) for UIResources (maybe someone can confirm this)

blocks|key|753684|text|这个与JDK6和JDK7一起工作。Copy%2Bpaste并玩得开心;)|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|753685|注意:对于JDK6，更改|753686|javax.swing.plaf.nimbus+to|CODE|753687|com.​sun.​java.​swing.​plaf.​nimbus。|753688|代码|753689|import+java.awt.*;
import+java.lang.reflect.*;
import+javax.swing.*;
import+javax.swing.plaf.nimbus.*;

public+class+Main+{

+public+static+void+main(String[]+args)
+++throws+InterruptedException,+InvocationTargetException+{

++SwingUtilities.invokeAndWait(new+Runnable()+{

+++@Override
+++public+void+run()+{
++++try+{
+++++UIManager.setLookAndFeel(new+NimbusLookAndFeel()+{

++++++@Override
++++++public+UIDefaults+getDefaults()+{
+++++++UIDefaults+ret+=+super.getDefaults();
+++++++ret.put("defaultFont",
+++++++++new+Font(Font.MONOSPACED,+Font.BOLD,+16));+//+supersize+me
+++++++return+ret;
++++++}

+++++});

+++++new+JFrame("Hello")+{

++++++{
+++++++setDefaultCloseOperation(EXIT_ON_CLOSE);
+++++++setLayout(new+FlowLayout(FlowLayout.LEFT));

+++++++setSize(500,+500);
+++++++setLocationRelativeTo(null);

+++++++add(new+JLabel("someLabel+1"));
+++++++add(new+JButton("someButton+1"));
+++++++add(new+JLabel("someLabel+2"));
+++++++add(new+JButton("someButton+2"));

+++++++setVisible(true);
++++++}

+++++};+++++
++++}+catch+(Exception+ex)+{
+++++throw+new+Error(ex);
++++}
+++}

++});
+}

}|code-block|syntax|javascript|753690|entityMap^0|2|W|0|0|C|0|0|Q|0|N|0|0|10|0|Z|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|J]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1E|8|@]|D|@]|E|$R|S]]|$1|T|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|U|$]]

This works with JDK6 and JDK7. Copy+paste and have fun ;)
Note: for JDK6, change 
<code>javax.swing.plaf.nimbus</code> to 
<code>com.​sun.​java.​swing.​plaf.​nimbus</code>.
<h2>Code</h2>
<pre><code>import java.awt.*;
import java.lang.reflect.*;
import javax.swing.*;
import javax.swing.plaf.nimbus.*;

public class Main {

 public static void main(String[] args)
 throws InterruptedException, InvocationTargetException {

 SwingUtilities.invokeAndWait(new Runnable() {

 @Override
 public void run() {
 try {
 UIManager.setLookAndFeel(new NimbusLookAndFeel() {

 @Override
 public UIDefaults getDefaults() {
 UIDefaults ret = super.getDefaults();
 ret.put(&quot;defaultFont&quot;,
 new Font(Font.MONOSPACED, Font.BOLD, 16)); // supersize me
 return ret;
 }

 });

 new JFrame(&quot;Hello&quot;) {

 {
 setDefaultCloseOperation(EXIT_ON_CLOSE);
 setLayout(new FlowLayout(FlowLayout.LEFT));

 setSize(500, 500);
 setLocationRelativeTo(null);

 add(new JLabel(&quot;someLabel 1&quot;));
 add(new JButton(&quot;someButton 1&quot;));
 add(new JLabel(&quot;someLabel 2&quot;));
 add(new JButton(&quot;someButton 2&quot;));

 setVisible(true);
 }

 }; 
 } catch (Exception ex) {
 throw new Error(ex);
 }
 }

 });
 }

}
</code></pre>

blocks|key|753743|text|nimbus默认值是延迟创建的，因此在绘制屏幕之前设置'defaultFont‘，将字体添加到父默认值，而不是添加到nimbus默认值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|753744|解决办法:强制nimbus初始化默认值，然后设置默认值：|753745|NimbusLookAndFeel+laf+=+new+NimbusLookAndFeel();
UIManager.setLookAndFeel(laf);
laf.getDefaults().put("defaultFont",+new+Font("Monospaced",+Font.BOLD,+12));|code-block|syntax|javascript|753746|注意:正如上面所建议的，这段代码比重写getDefaults()更有效。|753747|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The nimbus defaults are lazy created so setting 'defaultFont' before the screen is painted, will add the font to the parent defaults, and not to the nimbus defaults.

Workaround: force nimbus to initialize the defaults and set then the defaults:

<pre><code>NimbusLookAndFeel laf = new NimbusLookAndFeel();
UIManager.setLookAndFeel(laf);
laf.getDefaults().put("defaultFont", new Font("Monospaced", Font.BOLD, 12));
</code></pre>

Note: this code is more efficient then overriding getDefaults(), as suggested above.

blocks|key|907741|text|单行代码中的答案(假设您已经设置了Nimbus+LaF)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|907742|UIManager.getLookAndFeelDefaults().put("defaultFont",++new+Font(Font.SANS_SERIF,+0,+20));|offset|length|style|CODE|907743|当然，您需要在创建任何GUI组件之前调用它，即在设置LaF之后直接在主组件中进行调用。|907744|entityMap^0|0|0|2H|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

The answer in a single line of code (assuming you have already set Nimbus LaF):

<code>UIManager.getLookAndFeelDefaults().put("defaultFont", new Font(Font.SANS_SERIF, 0, 20));</code>

Of course, you need to call this before you create any GUI components, i.e. right in your main just after setting Nimbus LaF.

I'm referring to <a href="http://jasperpotts.com/blogfiles/nimbusdefaults/nimbus.html" rel="noreferrer">this Nimbus reference</a>. 

I tried to set global Font to be slightly larger:

<pre><code>UIManager.put("defaultFont", new Font(Font.SANS_SERIF, 0, 16));
</code></pre>

...works only for the menu but nothing else (buttons, labels).

I tried to change labels and buttons fonts with

<pre><code>UIManager.put("Button.font", new Font(Font.SANS_SERIF, 0, 16));
UIManager.put("Label.font", new Font(Font.SANS_SERIF, 0, 16));
</code></pre>

but the font remains.

The only thing that worked for me was deriving a font:

<pre><code>someButton.setFont(someButton.getFont().deriveFont(16f));
</code></pre>

But this is not an option, since this must be done for each
element manually.

Note, that deriving a font for UIManager doesn't work either:

<pre><code>UIManager.put("Label.font",
 UIManager.getFont("Label.font").deriveFont(16f));
</code></pre>

I tested everything under Linux and Windows: same behavior.

I just can't understand how an API can be so messy. If a method is called
setFont(..) then I expect it to set the font. If this method fails to
set the font in any thinkable circumstances, then it should be deprecated.

EDIT: 
The problem not only applies to Nimbus, but also to the default LAF.

Java: Altering UI fonts (Nimbus) doesn't work!

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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我指的是。我试图将全局字体设置为稍微大一点：UIManager.put("defaultFont", new Font(Font.SANS_SERIF, 0, 16));...works只适用于菜单，但nothing (按钮、标签)。我试着用UIManager.put("Button.font", new Font(F...

问Java:改变UI字体(Nimbus)是行不通的！
EN

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问Java:改变UI字体(Nimbus)是行不通的！EN