How do I parameterize a query containing an IN clause with a variable number of arguments, like this one? SELECT * FROM Tags WHERE Name IN (‘ruby’,’rails’,’scruffy’,’rubyonrails’) ORDER BY Count DESC In this query, the number of arguments could be anywhere from 1 to 5. I would prefer not to use a dedicated stored procedure … Read more
I am trying to search how to pass parameters in a Bash function, but what comes up is always how to pass parameter from the command line. I would like to pass parameters within my script. I tried: myBackupFunction(“..”, “…”, “xx”) function myBackupFunction($directory, $options, $rootPassword) { … } But the syntax is not correct. How … Read more
Please explain the use of the Xms and Xmx parameters in JVMs. What are the default values for them? 5 The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool. This means that your JVM will be started with Xms amount of … Read more
In an HTTP GET request, parameters are sent as a query string: http://example.com/page?parameter=value&also=another In an HTTP POST request, the parameters are not sent along with the URI. Where are the values? In the request header? In the request body? What does it look like? 9 The values are sent in the request body, in the … Read more
I came across some Java code that had the following structure: public MyParameterizedFunction(String param1, int param2) { this(param1, param2, false); } public MyParameterizedFunction(String param1, int param2, boolean param3) { //use all three parameters here } I know that in C++ I can assign a parameter a default value. For example: void MyParameterizedFunction(String param1, int param2, … Read more
I would like a JavaScript function to have optional arguments which I set a default on, which get used if the value isn’t defined (and ignored if the value is passed). In Ruby you can do it like this: def read_file(file, delete_after = false) # code end Does this work in JavaScript? function read_file(file, delete_after … Read more
The flag Xmx specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while Xms specifies the initial memory allocation pool. This means that your JVM will be started with Xms amount of memory and will be able to use a maximum of Xmx amount of memory. For example, starting a JVM like … Read more
No, the structure you found is how Java handles it (that is, with overloading instead of default parameters). For constructors, See Effective Java: Programming Language Guide’s Item 1 tip (Consider static factory methods instead of constructors) if the overloading is getting complicated. For other methods, renaming some cases or using a parameter object can help. This is … Read more
In Java args contains the supplied command-line arguments as an array of String objects. In other words, if you run your program as java MyProgram one two then args will contain [“one”, “two”]. If you wanted to output the contents of args, you can just loop through them like this… public class ArgumentExample { public static void main(String[] args) { for(int i = 0; i < args.length; … Read more
Try this: (not sure how many changes you have already made) public class Oops3 { public static void printer(double x, double y) { System.out.println(“x = ” + x + ” and y = ” + y); System.out.println(“The value from main is: ” + y);} public static void main(String[] args) { int z = 5; double … Read more
