Suppose you need to define a class which all it does is hold constants.
public static final String SOME_CONST = "SOME_VALUE";
What is the preferred way of doing this?
- Interface
- Abstract Class
- Final Class
Which one should ... |
Similar to how you can define an integer constant in hexadecimal or octal, can I do it in binary?
I admit this is a really easy (and stupid) question. My google ... |
Given:
public static final String XML_POLICY =
"<?xml version="1.0"?>"
...
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In the following code DEFAULT_CACHE_SIZE is declared later, but it is used to assign a value to String variable before than that, so was curious how is it possible?
public class Test ...
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to avoid magic numbers, i always use constants in my code. back in the old days we used to define constant sets in a methodless interface which has now become ... |
list.loadRequestParms(request, 'a', 20);
This method takes three parameters
- a request object.
- a char
- an integer
Now how to define these as constants somewhere and use it in this method.
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I am new to java, hence again another probably silly doubt.
I just want to know whether I can create public static final variables in an interface file. I know interfaces are ... |
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Most of the time I define constants in the same class where i want to use them.
But now i have to define all common constants in a separate class. I have ... |
I'm implementing a standard as an object oriented library in Java. Standard includes many messages which passing over network through terminals. Every message is implemented as a single class.
Some of ... |
Consider the following code
public class ColorScheme {
public static final int DARK_BLACK = 0,
...
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I want define some constants, specifically a Date and Calendar that are before my domain can exist. I've got some code that works but its ugly. I am looking for improvement ... |
Hi, I have a interface which only has constants declared in it. Now to access these constants from a class I can have two ways 1) As the constants are public and static I can access them directly in my class as InterfaceName.ConstantVar 2) I can make the class implememt the interface and then I can directly access the constants of ... |
If you declare a variable final and static it becomes a compile time constant. For instance the Math class has 2 contants, pi and e. public static final double PI = 3.14159265358979323846; public static final double E = 2.7182818284590452354; You can use them by saying Math.PI or Math.E (because they are static you don't need to create an instance of Math ... |
As usual, it depends on the situation. Some constants are values that you are allowed to pass into a particular method. Then it makes sense for the class that has the method to also have the constants. Some constants are used all over the system. Then it makes sense to make them more global in their own class. It's a neat ... |
If you're using JDK 5 or later, then yes enums are probably your best option. If you're stuck with JDK 1.4 or earlier, you might want to check out this article. Note that it was written before JDK 5 came out, and when it refers to "enum" it means "enum" as used in C/C++, not the newer Java enum. It's also ... |
As a JavaScript guy, I was a bit taken aback that I can't use strings in Java as switch-case argments and case elements. So I'm trying to do it anyway (sort of); by converting strings to hashCode() and using the resulting integer value. Let's say for example that I want to do something if I encounter a String. static final int ... |
Yes, I understood. Even I guessed the same thing. But I have around 20 class files in my project, spread across different packages and all my constants are defined in SpmlConstants.java. Suppose, in future I want to change the String value of another constant, then I need to check which all classes among those 20 classes use this constant and I ... |
I have the following situation. 1) I have a set of queries defined in the separate class as a strings 2) Based on the external conditions I have to use different query 3) In the future I might need to add more queries 4) I don't want to modify my client class every time there is new external condition 5) I ... |
"The constant interface pattern is a poor use of interfaces. That a class uses some constants internally is an implementation detail. Implementing a constant interface causes this implementation detail to leak into the class's exported API. It is of no consequence to the users of a class that the class implements a constant interface. In fact, it may even confuse them. ... |