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Logger slf4j advantages of formatting with {} instead of string concatenation
...stead. See e.g. http://slf4j.org/apidocs/org/slf4j/Logger.html#debug(java.lang.String, java.lang.Object[]).
Regarding the speed: Ceki posted a benchmark a while back on one of the lists.
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What is the memory consumption of an object in Java?
... 8, 8 [bytes]
Array element sizes: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]
java.lang.Integer object internals:
OFFSET SIZE TYPE DESCRIPTION VALUE
0 12 (object header) N/A
12 4 int Integer.value N/A
Instance size: 16 bytes (es...
What is the concept of erasure in generics in Java?
...a via compiler trickery. The compiled generic code actually just uses java.lang.Object wherever you talk about T (or some other type parameter) - and there's some metadata to tell the compiler that it really is a generic type.
When you compile some code against a generic type or method, the compile...
How to use enum values in f:selectItem(s)
...ls
</function-class>
<function-signature>
java.lang.Enum[] getEnumValues(java.lang.String)
</function-signature>
</function>
And finally call it like:
<p:selectOneMenu value="#{bean.type}">
<f:selectItems value="#{el:getEnumValues('package....
What is PECS (Producer Extends Consumer Super)?
...replaced with objects of type S.
Within the type system of a programming language, a typing rule
covariant if it preserves the ordering of types (≤), which orders types from more specific to more generic;
contravariant if it reverses this ordering;
invariant or nonvariant if neither of thes...
Who architected / designed C++'s IOStreams, and would it still be considered well-designed by today'
... I remember it being the subject of intense debate some years ago, on comp.lang.c++.moderated.
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The Definitive C Book Guide and List
...lect a community-maintained list of quality books on the c programming language, targeted at various skill levels.
1 An...
Is the != check thread safe?
... is the bytecode for test()
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
IF_ACMPEQ L1
...
as we can see it loads field a to local vars twice, it's a non-atomic operation, if a was changed in between by another thread co...
Strange out of memory issue while loading an image to a Bitmap object
...me great information for understanding and dealing with the exception java.lang.OutOfMemoryError: bitmap size exceeds VM budget when loading Bitmaps.
Read Bitmap Dimensions and Type
The BitmapFactory class provides several decoding methods (decodeByteArray(), decodeFile(), decodeResource(), etc....
List vs List
...t;String, String>()); results in found: ? extends java.util.Map<java.lang.String,java.lang.String> required: class or interface without bounds. List<Map<String, String>> mapList = new ArrayList<Map<String, String>>(); mapList.add(new TreeMap<String, String>());...