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What are the reasons why Map.get(Object key) is not (fully) generic
... the decision to not have a fully generic get method
in the interface of java.util.Map<K, V> .
11 Answers
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How to remove leading zeros from alphanumeric text?
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@Greg: This question is about Java, not JavaScript. Java SE has had the method String.replaceFirst() since version 1.4.
– Jonik
May 22 '12 at 10:37
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Do I need elements in persistence.xml?
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The persistence.xml has a jar-file that you can use. From the Java EE 5 tutorial:
<persistence>
<persistence-unit name="OrderManagement">
<description>This unit manages orders and customers.
It does not rely on any vendor-specific features and...
Propagate all arguments in a bash shell script
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For bash and other Bourne-like shells:
java com.myserver.Program "$@"
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How to count the number of occurrences of an element in a List
I have an ArrayList , a Collection class of Java, as follows:
22 Answers
22
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Google Guava vs. Apache Commons [closed]
I was looking for a bidirectional map implementation in Java, and stumbled upon these two libraries:
5 Answers
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Java Synchronized Block for .class
What does this java code mean? Will it gain lock on all objects of MyClass ?
4 Answers
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Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a
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With Java 8 you can use the new removeIf method. Applied to your example:
Collection<Integer> coll = new ArrayList<>();
//populate
coll.removeIf(i -> i == 5);
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When should I use File.separator and when File.pathSeparator?
...le part is implied. But who knows why they did a lot of what they did with Java.
– user489041
Dec 21 '16 at 17:34
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Is there a performance difference between a for loop and a for-each loop?
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From Item 46 in Effective Java by Joshua Bloch :
The for-each loop, introduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulting idiom
applies equally...