Change your first comparison to be: if (a == b) return true; This not only catches the “both null” cases, but also “compare an array to itself” case. However, for a simpler alternative – use Arrays.equals which has overloads for each primitive type. (The implementation is very similar to yours, except it hoists the array … Read more
In addition to the reasons posted by Dan: Value types are, by definition those types which store their values in themselves, rather than referring to a value somewhere else. That’s why value types are called “value types” and reference types are called “reference types”. So your question is really “why does a string refer to … Read more
What is the advantage of keeping two separate representations for numbers, strings and Booleans? Performance In what context could one need the distinction between primitive types and objects? Coercion comes to mind. 0 == false while new Number(0) != false So for instance: var a = new Boolean(false); if(a) { // This code runs } … Read more
In PHP 7 they added the following: Type declarations allow functions to require that parameters are of a certain type at call time. If the given value is of the incorrect type, then an error is generated: in PHP 5, this will be a recoverable fatal error, while PHP 7 will throw a TypeError exception. … Read more
The JLS lists 19 specific conversions on primitive types are called the widening primitive conversions: byte to short, int, long, float, or double short to int, long, float, or double char to int, long, float, or double int to long, float, or double long to float or double float to double Note the missing conversions … Read more
There is no implicitly cast in Swift. Easy way of conversion in swift is using constructor of particular type. Like if you want to get Float from double then you can use Float(doubleValue) and Same way if you want to convert float to integer then you can use Int(floatValue). In your case: let intValue = … Read more
I think the question was not about casting primitives and wrappers in general. The question was about difference between casting int to java.lang.Long and int to java.lang.Short for example. JLS: “In addition, if the expression is a constant expression (§15.28) of type byte, short, char or int: A narrowing primitive conversion may be used if … Read more
But it is not true, why? §5.2.4/1: The only effect is the evaluation of the postfix-expression before the dot or arrow. Where the postfix-expression is the expression of the object for which the call takes place. Thus a pseudo destructor call, as a call to a trivial destructor, does not end the lifetime of the … Read more
While it is not possible to write a function that simply swaps two variables, it is possible to write a helper function that allows you to: Swap two variables using only one statement Without temporary variables in the caller’s code Without ‘boxing’ primitives With a few overloads (one of them using generics), it works for … Read more
What’s happening is that your number is wrapping around. More specifically, you’ve got a number 30,000, which in binary is: 0111 0101 0011 0000 When you add it to itself, and carry the 1’s, you get: 1110 1010 0110 0000 (Note: it’s very easy to multiply a number by 2 in binary — just shift … Read more