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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;
}...
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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Get current batchfile directory
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Dan Dascalescu
98.2k3636 gold badges263263 silver badges333333 bronze badges
answered Jun 12 '13 at 11:13
StolegStol...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... | stack=0x7fe90d3000-0x7fe90d5000 stackSize=8MB
| held mutexes=
at java.lang.Thread.sleep!(Native method)
- sleeping on <0x0a2ae345> (a java.lang.Object)
at java.lang.Thread.sleep(Thread.java:1031)
- locked <0x0a2ae345> (a java.lang.Object)
//真正导致ANR的问题点，可以发...
What is the meaning of erb?
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Mark AmeryMark Amery
98.9k4848 gold badges336336 silver badges379379 bronze badges
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Setting design time DataContext on a Window is giving a compiler error?
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Jon EricksonJon Erickson
98.1k3636 gold badges131131 silver badges169169 bronze badges
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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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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...
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...