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How do I set a JLabel's background color?
...is not painted, since the default of opaque is false for JLabel.
From the JavaDocs:
If true the component paints every pixel within its bounds. Otherwise, the component may not paint some or all of its pixels, allowing the underlying pixels to show through.
For more information, read the Jav...
functional interface that takes nothing and returns nothing [duplicate]
...; is that it may
* take any action whatsoever.
*
* @see java.lang.Thread#run()
*/
public abstract void run();
}
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How do you specify a byte literal in Java?
...
You can use a byte literal in Java... sort of.
byte f = 0;
f = 0xa;
0xa (int literal) gets automatically cast to byte. It's not a real byte literal (see JLS & comments below), but if it quacks like a duck, I call it a duck.
What you can't ...
Do fragments really need an empty constructor?
...k: https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/app/Fragment.java
You will see the instantiate(..) method in the Fragment class calls the newInstance method:
public static Fragment instantiate(Context context, String fname, @Nullable Bundle args) {
try {...
Best practice to validate null and empty collection in Java
...s about the same thing with C#, but the principles applies equally well to java. Like mentioned there, null should be returned only if
null might mean something more specific;
your API (contract) might force you to return null.
...
What is the Java equivalent for LINQ? [closed]
What is Java equivalent for LINQ?
34 Answers
34
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How to use Java property files?
... have a list of key/value pairs of configuration values I want to store as Java property files, and later load and iterate through.
...
How can I “pretty print” a Duration in Java?
Does anyone know of a Java library that can pretty print a number in milliseconds in the same way that C# does?
11 Answers
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Any reason why scala does not explicitly support dependent types?
...a {
| val foo = foo1
| val bar = new foo.Bar
| }
sigma: java.lang.Object with Sigma{val bar: this.foo.Bar} = $anon$1@e3fabd8
and in fact, this is a crucial part of the encoding of dependent method types which is needed to escape from the 'Bakery of Doom' in Scala prior to 2.10 (...
Removing whitespace from strings in Java
...string is not modified as some of the answers sort of imply.
(Experienced Java developers might say "of course, you can't actually modify a String", but the target audience for this question may well not know this.)
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