This question already has answers here: Initialization of an ArrayList in one line (33 answers) Closed 6 years ago. ArrayList or List declaration in Java has questioned and answered how to declare an empty ArrayList but how do I declare an ArrayList with values? I’ve tried the following but it returns a syntax error: import … Read more
I need a big null array in C as a global. Is there any way to do this besides typing out char ZEROARRAY[1024] = {0, 0, 0, /* … 1021 more times… */ }; ? 2 Answers 2
I’m looking for a clean and efficient method of declaring multiple variables of the same type and of the same value. Right now I have: String one = “”, two = “”, three = “” etc… But I’m looking for something like: String one,two,three = “” Is this something that is possible to do in … Read more
Error % javac StringTest.java StringTest.java:4: variable errorSoon might not have been initialized errorSoon[0] = “Error, why?”; Code public class StringTest { public static void main(String[] args) { String[] errorSoon; errorSoon[0] = “Error, why?”; } } 11 Answers 11
I have a use case where I need to call a (non-static) method in the bean only-once at the ApplicationContext load up. Is it ok, if I use MethodInvokingFactoryBean for this? Or we have a some better solution? As a side note, I use ConfigContextLoaderListener to load the Application Context in web application. And want, … Read more
Suppose I have this function: void my_test() { A a1 = A_factory_func(); A a2(A_factory_func()); double b1 = 0.5; double b2(0.5); A c1; A c2 = A(); A c3(A()); } In each grouping, are these statements identical? Or is there an extra (possibly optimizable) copy in some of the initializations? I have seen people say both … Read more
As far as I understood the “static initialization block” is used to set values of static field if it cannot be done in one line. But I do not understand why we need a special block for that. For example we declare a field as static (without a value assignment). And then write several lines … Read more
This question already has answers here: Create ArrayList from array (40 answers) Initialization of an ArrayList in one line (33 answers) Closed 5 years ago. I am aware that you can initialize an array during instantiation as follows: String[] names = new String[] {“Ryan”, “Julie”, “Bob”}; Is there a way to do the same thing … Read more
C++ Notes: Array Initialization has a nice list over initialization of arrays. I have a int array[100] = {-1}; expecting it to be full with -1’s but its not, only first value is and the rest are 0’s mixed with random values. The code int array[100] = {0}; works just fine and sets each element … Read more
In certain other languages (AS3 for example), it has been noted that initializing a new array is faster if done like this var foo = [] rather than var foo = new Array() for reasons of object creation and instantiation. I wonder whether there are any equivalences in PHP? class Foo { private $arr = … Read more
