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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>());...
What is meant by immutable?
...g copies out from your specific field of control.
To recap, in Java, java.lang.String is an immutable object (it cannot be changed once it's created) and java.lang.StringBuilder is a mutable object because it can be changed without creating a new instance.
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