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How can I initialize an ArrayList with all zeroes in Java?
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// 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);
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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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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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What does the question mark in Java generics' type parameter mean?
... the examples that accompany the Stanford Parser. I've been developing in Java for about 4 years, but have never had a very strong understanding of what this style of code is supposed to indicate.
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Is there “Break on Exception” in IntelliJ?
...e the stack is walked looking for catch/finally blocks to execute.
TIP: Java tends to throw a lot of exceptions internally when loading classes, so this breaking on all exceptions can become quite tedious. The good news is that you can exclude certain types of exception using the condition field....
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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Java 8 Streams: multiple filters vs. complex condition
...E: tests runs on
8 CPU
1 GB RAM
OS version: 16.04.1 LTS (Xenial Xerus)
java version: 1.8.0_121
jvm: -XX:+UseG1GC -server -Xmx1024m -Xms1024m
UPDATE:
Java 11 has some progress on the performance, but the dynamics stay the same
Benchmark mode: Throughput, ops/time
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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;
}...
Why is C so fast, and why aren't other languages as fast or faster? [closed]
...tic typing of variables.
That said, many languages and platforms, such as Java (with its Java Virtual Machine) and .NET (with its Common Language Runtime) have improved performance over the years with advents such as just-in-time compilation which produces native machine code from bytecode to achie...
STL or Qt containers?
...when using meta-types or signals and slots.
can use STL-style iterators or Java-style iterators
are streamable with QDataStream
are used extensively in Qt's API
have a stable implementation across operating systems. A STL implementation must obey the C++ standard, but
is otherwise free to do as it p...