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Java Generics: Cannot cast List to List? [duplicate]
...'t know whether it's safe or not.
Have a look at this section of Angelika Langer's Java Generics FAQ for more information.
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How do you echo a 4-digit Unicode character in Bash?
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That's true. I discovered i was using LANG=C instead of LANG=en_US.UTF-8. Now my terminals in Gnome show the symbols properly... The real terminals (tty1-6) still don't though.
– trusktr
Oct 3 '12 at 0:09
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Format an Integer using Java String Format
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If you are using a third party library called apache commons-lang, the following solution can be useful:
Use StringUtils class of apache commons-lang :
int i = 5;
StringUtils.leftPad(String.valueOf(i), 3, "0"); // --> "005"
As StringUtils.leftPad() is faster than String.format(...
Create PostgreSQL ROLE (user) if it doesn't exist
...t by using another PL. The DO statement uses plpgsql as default procedural language. The syntax allows to omit the explicit declaration:
DO [ LANGUAGE lang_name ] code
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lang_name
The name of the procedural language the code is written in. If
omitted, the default is plpgsql.
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What is a WeakHashMap and when to use it? [duplicate]
...al Map
implementation where the keys of the
map are stored in a
java.lang.ref.WeakReference. By
storing the keys in a weak reference,
key-value pairs can dynamically be
dropped from the map when the only
reference to the key is from the weak
reference. This makes the WeakHashMap
an...
How to stop an unstoppable zombie job on Jenkins without restarting the server?
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I got issue when execute this script, any idea? groovy.lang.MissingMethodException: No signature of method: hudson.model.FreeStyleBuild.finish() is applicable for argument types: (hudson.model.Result, java.io.IOException) values: [ABORTED, java.io.IOException: Aborting build] Pos...
Do Java arrays have a maximum size?
...[Integer.MAX_VALUE - 4];
}
}
You get:
Exception in thread "main" java.lang.OutOfMemoryError:
Requested array size exceeds VM limit
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JAVA线程池管理及分布式HADOOP调度框架搭建 - 人工智能(AI) - 清泛IT社区，...
...现，这里说下java语言的实现多线程的两种方式：扩展java.lang.Thread类、实现java.lang.Runnable接口。
先看个例子，假设有100个数据需要分发并且计算。看下单线程的处理速度：package thread;
import java.util.Vector;
public class OneMain {
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Dealing with “Xerces hell” in Java/Maven?
... When I try this, I get JavaMelody and Spring throwing java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal at runtime.
– David Moles
May 28 '14 at 19:15
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Get OS-level system information
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The java.lang.management package does give you a whole lot more info than Runtime - for example it will give you heap memory (ManagementFactory.getMemoryMXBean().getHeapMemoryUsage()) separate from non-heap memory (ManagementFactory.g...