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Good Hash Function for Strings
... computinglife.wordpress.com/2008/11/20/… explaining why 31 was used for Java string hashing. There is no mathematical proof given, but it does explain the general concept as to why primes work better.
– Pharap
Sep 24 '13 at 0:39
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What is the difference between getFields and getDeclaredFields in Java reflection
...tween the getFields method and the getDeclaredFields method when using Java reflection.
4 Answers
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Java ArrayList replace at specific index
I need help with this java please. I created an ArrayList of bulbs, and I'm trying to replace a bulb at specific index with another bulb. So with the following heading, how do I proceed?
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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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Java 8 Streams - collect vs reduce
...sing an Integer constructor (new Integer(6)), which is deprecated in later Java versions.
– MC Emperor
Jun 13 '19 at 10:54
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Overloaded method selection based on the parameter's real type
...meter type. Am I missing
something?
Yes. Your expectation is wrong. In Java, dynamic method dispatch happens only for the object the method is called on, not for the parameter types of overloaded methods.
Citing the Java Language Specification:
When a method is invoked (§15.12), the
numb...
File path to resource in our war/WEB-INF folder?
...B-INF/test/foo.txt");
http://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/ServletContext.html#getRealPath(java.lang.String)
That will get you the full system path to the resource you are looking for. However, that won't work if the Servlet Container never expands the WAR file (like ...
What exactly is a Context in Java? [duplicate]
I Googled this and read the Java documentation, but I'm a bit confused. Can somebody please explain what a Context is in plain English?
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实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的选择。
如此一来，数据库就彻底翻身做主人了，虽然系统仍然是轮询，但已经从轮询别人变成了轮询自己，效率不可相提并论，从强奸变成了自慰，还是有进步意义的。相应的，我们可以加快轮询的频率而不会造成太大的压...
How do I use the new computeIfAbsent function?
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Suppose you have the following code:
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class Test {
public static void main(String[] s) {
Map<String, Boolean> whoLetDogsOut = new ConcurrentHashMap<>();
whoLetDo...