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How to synchronize a static variable among threads running different instances of a class in Java?
...se it's a read / modify / write sequence. As noted in a different answer, java.util.concurrent.atomic.AtomicInteger is likely the right choice here.
– fadden
Apr 17 '13 at 23:35
4...
使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...board 的 MITVRHelper 应用程序
支持 Expeditions：PanoramaActivity.java
支持 Virtuality：VirtualActivity.java
结论：下一步
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使用虚拟现实和App Inventor进行实验
该项目是麻省理工学院 App Inventor 2011 年 Google Summer ...
What are enums and why are they useful?
...ulation above does not give you is nice switch cases. For enum types, the Java switch uses the type of its variable to infer the scope of enum cases, so for the enum Color above you merely need to say:
Color color = ... ;
switch (color) {
case RED:
...
break;
}
Note it's not ...
How can I create tests in Android Studio?
...sts that you will do.
Local unit tests. These are run locally on the JVM (Java Virtual Machine). Since they are local, they are fast. You can use them to test the parts of your code that just need Java and not the Android APIs. (Sometimes you can make a fake API object to test more things locally. ...
How can I initialize an ArrayList with all zeroes in Java?
...
// apparently this is broken. Whoops for me!
java.util.Collections.fill(list,new Integer(0));
// this is better
Integer[] data = new Integer[60];
Arrays.fill(data,new Integer(0));
List<Integer> list = Arrays.asList(data);
...
Load image from url
...[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}...
Difference between thread's context class loader and normal classloader
...to accept the ClassLoader as a parameter, and this mistake has haunted the Java community to this day.
That said, many many JDK classes use one of a few hacks to guess some class loader to use. Some use the ContextClassLoader (which fails when you run different apps on a shared thread pool, or when...
Likelihood of collision using most significant bits of a UUID in Java
...
I thinks this is the best example for using randomUUID :
http://www.javapractices.com/topic/TopicAction.do?Id=56
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How do I turn a String into a InputStreamReader in java?
... There’s not the slightest reason to assume that this class is “since Java 1.4”. That wrong version number is especially weird as Java 1.4 introduced NIO and it makes little sense to introduce an API and its conceptional successor within the same version.
– Holger
...
What is meant by immutable?
...be the dumbest question ever asked but I think it is quite confusing for a Java newbie.
17 Answers
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