primitive

I have a SimpleIntegerProperty which should be able to store null . However, this is not possible, as written in the JavaDoc of IntegerProperty : Note: setting or binding this property to a null value will set the property to "0.0". See setValue(java.lang.Number) . This also applies to other properties, such as LongProperty , FloatProperty , DoubleProperty , and BooleanProperty (but not to StringProperty , which allows null !). Why is this the case? Is there a workaround to store null in these properties? user7291698 The IntegerProperty.setValue(java.lang.Number) method is specified in the

I'm reading Professional JavaScript for Web Developers 3rd ed. and in the summary of chapter 4 one can read: Two types of values can be stored in JavaScript variables: primitive values and reference values. Primitive values have one of the five primitive data types: Undefined, Null, Boolean, Number, and String. Primitive and reference values have the following characteristics: Primitive values are of a fixed size and so are stored in memory on the stack. But I can have different strings, say: var a = "ABC"; // or var b = "Some very irritatingly long string..." They clearly differ in size, so

Please take a look at below example i cant understand the relation between char and byte byte b = 1; char c = 2; c = b; // line 1 Give me compilation Error because c is type of char and b is type of byte so casting is must in such condition but now the tweest here is when i run below code final byte b = 1; char c = 2; c = b; // line 2 line 2 compile successfully it doesn't need any casting at all so my question is why char c behave different when i use final access modifier with byte Because qualifying it with final makes the variable a constant variable, which is a constant expression . So

So, you know how the primitive of type char has the size of 1 byte? How would I make a primitive with a custom size? So like instead of an in int with the size of 4 bytes I make one with size of lets say 16. Is there a way to do this? Is there a way around it? Normally you'd just make a struct that represents the data in which you're interested. If it's 16 bytes of data, either it's an aggregate of a number of smaller types or you're working on a processor that has a native 16-byte integral type. If you're trying to represent extremely large numbers, you may need to find a special library that

This question already has answers here : How many integers can I create in 1GB memory? (2 answers) Closed 3 years ago . Quoting the following from Algorithms 4th edition "For example, if you have 1GB of memory on your computer (1 billion bytes), you cannot fit more than about 32 million int values or 16 million double values in memory at one time." int - 4 bytes 32 million x 4 = 128 million bytes Help me understand, why we can't fit 32 million int values, the above 128 million bytes is about 1/10 of the overall memory consumption of 1GB or 1 billion bytes. Katona That depends on how you

I need a float[] to be sorted. And I need to know where the old indices are in new array. That's why I can't use Array.Sort(); or whatever. So I would like to write a function that sorts the array for me and remembers from what index it took each value: float[] input = new float[] {1.5, 2, 0, 0.4, -1, 96, -56, 8, -45}; // sort float[] output; // {-56, -45, -1, 0, 0.4, 1.5, 2, 8, 96}; int[] indices; // {6, 8, 4, 2, 3, 0, 1, 7, 5}; Size of arrays would be around 500. How should I approach this ? What sorting algorithm etc. After solved: It always surprises me how powerful C# is. I didn't even

In C++ we can make primitives unsigned . But they are always positive. Is there also a way to make unsigned negative variables? I know the word unsigned means "without sign", so also not a minus (-) sign. But I think C++ must provide it. No. unsigned can only contain nonnegative numbers. If you need a type that only represent negative numbers, you need to write a class yourself, or just interpret the value as negative in your program. (But why do you need such a type?) unsigned integers are only positive. From 3.9.1 paragraph 3 of the 2003 C++ standard: The range of nonnegative values of a

I want to create a mapping that takes a String as the key and a primitive as the value. I was looking at the Java docs and did not see that Primitive was a class type, or that they shared some kind of wrapping class. How can I constrain the value to be a primitive? Map<String, Primitive> map = new HashMap<String, Primitive>(); khachik Java Autoboxing allows to create maps on Long, Integer, Double and then operate them using primitive values. For example: java.util.HashMap<String, Integer> map = new java.util.HashMap<String, Integer>(); map.put("one", 1); // 1 is an integer, not an instance of