Compiling error: Return type for the method is missing
You need to use the name of your class in constructor: otherwise compiler will think you are about to declare a method and is confused about the missing return type obviously
Java
Using Enum values as String literals
You can’t. I think you have FOUR options here. All four offer a solution but with a slightly different approach… Option One: use the built-in name() on an enum. This is perfectly fine if you don’t need any special naming format. Option Two: add overriding properties to your enums if you want more control Option Three: use static finals instead … Read more
Create a List of primitive int?
In Java the type of any variable is either a primitive type or a reference type. Generic type arguments must be reference types. Since primitives do not extend Object they cannot be used as generic type arguments for a parametrized type. Instead use the Integer class which is a wrapper for int: If your using Java 7 you can simplify … Read more
What is setBounds and how do I use it?
I cannot find anything on setBounds, what it is for, or what its function actually is. Could someone clear me up on this? Thanks so much!
Always Round UP a Double
You can use Math.ceil() method. See JavaDoc link: https://docs.oracle.com/javase/10/docs/api/java/lang/Math.html#ceil(double) From the docs: ceil Returns the smallest (closest to negative infinity) double value that is greater than or equal to the argument and is equal to a mathematical integer. Special cases: If the argument value is already equal to a mathematical integer, then the result is the same as … Read more
What do curly braces in JavaScript mean?
In your case it is an object passed to your css function. Here you can use this too Here is another example of object A fiddle is here.
What Java ORM do you prefer, and why?
It’s a pretty open ended question. I’ll be starting out a new project and am looking at different ORMs to integrate with database access. Do you have any favorites? Are there any you would advise staying clear of?
Unsigned long in Java
Currently, I am using signed values, -2^63 to 2^63-1. Now I need the same range (2 * 2^64), but with positive values only. I found the java documentations mentioning unsigned long, which suits this use. I tried to declare 2^64 to a Long wrapper object, but it still loses the data, in other words, it … Read more
What is the difference between response.sendRedirect() and request.getRequestDispatcher().forward(request,response)
To simply explain the difference, doesn’t prepend the contextpath (refers to the application/module in which the servlet is bundled) but, whereas will prepend the contextpath of the respective application Furthermore, Redirect request is used to redirect to resources to different servers or domains. This transfer of control task is delegated to the browser by the container. That … Read more
java uses or overrides a deprecated API error
Those are not errors, they are warning, your code compiled. To explain these lines : Note: MyClass.java uses or overrides a deprecated API. You are doing a call of DataInputStream#readLine which is deprecated since JDK 1.1 as per the documentation : Deprecated.This method does not properly convert bytes to characters. As of JDK 1.1, the preferred way … Read more