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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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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...
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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How to make the division of 2 ints produce a float instead of another int?
...ill be a floating point operation, even if the other operand is integral. Java Language Specification, §4.2.4 and §15.17
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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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How to log request and response body with Retrofit-Android?
...ven though there is no integrated logging by default, you can leverage any Java logger and use it within a customized OkHttp interceptor.
further information about Retrofit 2 please refer :
Retrofit — Getting Started and Create an Android Client
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Vim 80 column layout concerns
...augroup collumnLimit
autocmd!
autocmd BufEnter,WinEnter,FileType scala,java
\ highlight CollumnLimit ctermbg=DarkGrey guibg=DarkGrey
let collumnLimit = 79 " feel free to customize
let pattern =
\ '\%<' . (collumnLimit+1) . 'v.\%>' . collumnLimit . 'v'
autocmd BufEnter...
Difference between wait() and sleep()
...it of missing information. Many people wrote down the definitions from the Javadoc and also the meaning of the two english words but I do not see Why I should ever use sleep instead of wait? What is the benchmarking and speed difference between the two? If I can do everything that I can do with sle...
Difference between Inheritance and Composition
...same?
If I want to implement the composition pattern, how can I do that in Java?
17 Answers
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