default-value

"It is important to point out that the content field of the template is by default set to null (as Java does with all noninitialized object fields upon creation)." It is from book "JavaSpaces Principles Patterns and Practice" Here is code: public class Message implements Entry { public String content; public Message() { } } I wonder if this is true, because I watched somewhere on internet that this is not true? Yes, this is true, but it may not mean quite what you think it means. All object fields will be initialized to null if no value is specified, but primitive types have other default

Can a function's default parameter value be accessed from a function extension, or anywhere else? fun DieRoll.cheatRoll():Int = roll(min = max -1) fun roll(min: Int = 1, max: Int = 6): Int = (min..max).rand() guenhter No, this is not possible. The default values are not accessible. They are just contained in a bridge-method in the bytecode: fun test(a: Int = 123) { } fun test2() { test() test(100) } Results in the bytecode: public final test(int arg0) { //(I)V <localVar:index=0 , name=this , desc=Lorg/guenhter/springboot/kt/Fun;, sig=null, start=L1, end=L2> <localVar:index=1 , name=a , desc=I,

I am trying to initialize 2-dimensional array of integer values with -1. When I create a new array, it is automatically filled with 0. I know I can do it with 2 for cycles, but I imagine there should be some way of doing this while the array is being build (so I don't have to go through it two times), so that instead of 0, provided value would be inserted. Is it possible? If not during the initial building of the array, is there some other time or code saving way, or am I stuck with 2 for cycles? With a multidimensional array, the loops are most likely the best approach, unless the array is

And can I therefore safely refactor all instances of class Blah { // ... private $foo = null; // ... } to class Blah { // ... private $foo; // ... } ? Simple answer, yes. See http://php.net/manual/en/language.types.null.php The special NULL value represents a variable with no value. NULL is the only possible value of type null. You can easily test by performing a var_dump() on the property and you will see both instances it will be NULL class Blah1 { private $foo; function test() { var_dump($this->foo); } } $test1 = new Blah1(); $test1->test(); // Outputs NULL class Blah2 { private $foo = NULL

If I am serializing and later deserializing a class using DataContractSerializer how can I control the initial values of properties that were not serialized? Consider the Person class below. Its data contract is set to serialize the FirstName and LastName properties but not the IsNew property. I want IsNew to initialize to TRUE whether a new Person is being instantiate as a new instance or being deserialized from a file. This is easy to do through the constructor, but as I understand it DataContractSerializer does not call the constructor as they could require parameters. [DataContract(Name=