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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 to pass arguments from command line to gradle
I'm trying to pass an argument from command line to a java class. I followed this post: http://gradle.1045684.n5.nabble.com/Gradle-application-plugin-question-td5539555.html but the code does not work for me (perhaps it is not meant for JavaExec?). Here is what I tried:
...
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);
...
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
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I thinks this is the best example for using randomUUID :
http://www.javapractices.com/topic/TopicAction.do?Id=56
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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;
}...
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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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
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What is the difference between a string and a byte string?
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Mark Amery
98.9k4848 gold badges336336 silver badges379379 bronze badges
answered Jul 9 '15 at 15:46
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