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Why should I care that Java doesn't have reified generics?
...n interview recently as something the candidate wished to see added to the Java language. It's commonly-identified as a pain that Java doesn't have reified generics but, when pushed, the candidate couldn't actually tell me the sort of things that he could have achieved were they there.
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Java executors: how to be notified, without blocking, when a task completes?
... submit these to ExecutorService. Or, see below for a mechanism built into Java 8.
class CallbackTask implements Runnable {
private final Runnable task;
private final Callback callback;
CallbackTask(Runnable task, Callback callback) {
this.task = task;
this.callback = callback;
}...
How do I read / convert an InputStream into a String in Java?
If you have a java.io.InputStream object, how should you process that object and produce a String ?
59 Answers
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Converting 'ArrayList to 'String[]' in Java
...ght I convert an ArrayList<String> object to a String[] array in Java?
16 Answers
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What is a raw type and why shouldn't we use it?
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What is a raw type?
The Java Language Specification defines a raw type as follows:
JLS 4.8 Raw Types
A raw type is defined to be one of:
The reference type that is formed by taking the name of a generic type declaration without an accompanying typ...
Java Timer vs ExecutorService?
I have code where I schedule a task using java.util.Timer . I was looking around and saw ExecutorService can do the same. So this question here, have you used Timer and ExecutorService to schedule tasks, what is the benefit of one using over another?
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Variable length (Dynamic) Arrays in Java
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Yes: use ArrayList.
In Java, "normal" arrays are fixed-size. You have to give them a size and can't expand them or contract them. To change the size, you have to make a new array and copy the data you want - which is inefficient and a pain for you...
How to fix: “No suitable driver found for jdbc:mysql://localhost/dbname” error when using pools? [du
....jar && wget http://central.maven.org/maven2/mysql/mysql-connector-java/5.1.27/mysql-connector-java-5.1.27.jar
– jmojico
Dec 17 '19 at 16:38
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How to write a UTF-8 file with Java?
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If you read the Java docs on the link shown in the question, then it tells you the version of the Commons IO API where the write APIs were introduced. It looks like the write APIs were introduced from v2.0 onwards.
– A_...
Uncatchable ChuckNorrisException
Is it possible to construct a snippet of code in Java that would make a hypothetical java.lang.ChuckNorrisException uncatchable?
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