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From: =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne@vajhoej.dk>
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Subject: Re: Where does the look and feel come from?
Date: Mon, 22 Feb 2016 20:52:32 -0500
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On 2/22/2016 3:56 PM, Eric Douglas wrote:
> First, the javax.swing.UIManager.setLookAndFeel(), what is the
> default value if I don't call this method?

https://docs.oracle.com/javase/8/docs/api/javax/swing/UIManager.html

says:

Default look and feel
The class used for the default look and feel is chosen in the following 
manner:

1.    If the system property swing.defaultlaf is non-null, use its value 
as the default look and feel class name.
2.    If the Properties file swing.properties exists and contains the 
key swing.defaultlaf, use its value as the default look and feel class 
name. The location that is checked for swing.properties may vary 
depending upon the implementation of the Java platform. Typically the 
swing.properties file is located in the lib subdirectory of the Java 
installation directory. Refer to the release notes of the implementation 
being used for further details.
3.    Otherwise use the cross platform look and feel.

>                                             Should this be the same
> on all systems running the same OS and/or the same JRE, or does this
> pull from something like Windows themes?

It depends on the look and feel.

The name "cross platform look and feel" seems to indicate that
it should be similar across anything.

The documentation:

https://docs.oracle.com/javase/8/docs/api/javax/swing/plaf/metal/MetalLookAndFeel.html

sort of confirms that.

> Second, where do the values come from, such as
> UIManager.get("CheckBox.icon") should this return the same image on 2
> machines running the same OS and/or the same JRE with the same look
> and feel,

I have never played with that.

I would expect that the answer is look and feel specific.

I would expect that Metal would be the same anywhere but
that the system default would change with the OS setting.

Expect = I don't know and are just guessing.

>           or where would it get set?

The look and feel could probably get the information from a config file
or a database if it wanted to.

It can also be set with the put method!   :-)

Arne