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Remove elements from collection while iterating
... new elements during iteration.
Using JDK >= 8
For those working with Java 8 or superior versions, there are a couple of other techniques you could use to take advantage of it.
You could use the new removeIf method in the Collection base class:
ISBN other = new ISBN("0-201-63361-2");
books.re...
Generating all permutations of a given string
...a and ab , but what about longer string such as abcdefgh ? Is there any Java implementation example?
52 Answers
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Backing beans (@ManagedBean) or CDI Beans (@Named)?
I've just started reading through Core JavaServer Faces, 3rd Ed. and they say this (emphasis mine):
5 Answers
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Why is Class.newInstance() “evil”?
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The Java API documentation explains why (http://java.sun.com/javase/6/docs/api/java/lang/Class.html#newInstance()):
Note that this method propagates any exception thrown by the nullary constructor, including a checked excepti...
Redirect to an external URL from controller action in Spring MVC
...be taken as default, if the added thing is value ?
– JAVA
Sep 14 '18 at 12:14
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Custom Adapter for List View
...tivity xml file, and an xml file for each list item type.
OptionsActivity.java:
public class OptionsActivity extends ListActivity {
private static final int LIST_ITEM_TYPE_1 = 0;
private static final int LIST_ITEM_TYPE_2 = 1;
private static final int LIST_ITEM_TYPE_COUNT = 2;
pri...
compareTo() vs. equals()
When testing for equality of String 's in Java I have always used equals() because to me this seems to be the most natural method for it. After all, its name already says what it is intended to do. However, a colleague of mine recently told me had been taught to use compareTo() == 0 instead of ...
Is SonarQube Replacement for Checkstyle, PMD, FindBugs?
... as a few other "plugins" such as Cobertura (code coverage) by default for Java projects. The main added value, however, is that it stores the history in a database. You can then see the trend. Are you improving the code base or are you doing the opposite? Only a tool with memory can tell you that.
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Convert hex string to int
...'s besides the point... thank you for the quick answer!!!! Also curse you java for your terrible error message... "It's to big" would have been helpful.
– Roloc
Jun 25 '12 at 18:03
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ConcurrentHashMap vs Synchronized HashMap
...read tries to modify it while another is iterating over it.
This article Java 7: HashMap vs ConcurrentHashMap is a very good read. Highly recommended.
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