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“implements Runnable” vs “extends Thread” in Java
From what time I've spent with threads in Java, I've found these two ways to write threads:
42 Answers
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Why are arrays covariant but generics are invariant?
From Effective Java by Joshua Bloch,
9 Answers
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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 ...
How to check if a json key exists?
...has":
http://developer.android.com/reference/org/json/JSONObject.html#has(java.lang.String)
Returns true if this object has a mapping for name. The mapping may be NULL.
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Why is String immutable in Java?
...e a copy, and not change its copy. When thinking of a problem with mutable java.lang.Strings, think of how C++ solves this problem (since it has mutable std::strings.
– Limited Atonement
Jan 13 '16 at 15:48
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Difference between Static and final?
I'm always confused between static and final keywords in java .
11 Answers
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Failed to locate the winutils binary in the hadoop binary path
...OOP_HOME to extracted directory [path], but also provide system property -Djava.library.path=[path]\bin to load native libs (dll).
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How to run a background task in a servlet based web application?
I'm using Java and I want to keep a servlet continuously running in my application, but I'm not getting how to do it. My servlet has a method which gives counts of the user from a database on a daily basis as well as the total count of the users from the whole database. So I want to keep the servlet...
Test if a string contains any of the strings from an array
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EDIT: Here is an update using the Java 8 Streaming API. So much cleaner. Can still be combined with regular expressions too.
public static boolean stringContainsItemFromList(String inputStr, String[] items) {
return Arrays.stream(items).anyMatch(inputStr:...
Why use a prime number in hashCode?
...e number of buckets is unlikely to be divisible by it (and in fact, modern java HashMap implementations keep the number of buckets to a power of 2).
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