Defining constant string in Java

Question

I have a list of constant strings that I need to display at different times during my Java program   In C I could define the strings like this at the top of my code    define WELCOME MESSAGE  Hello  welcome to the server   define WAIT MESSAGE  Please wait 5 seconds   define EXIT MESSAGE  Bye     I am wondering what is the standard way of doing this kind of thing in Java

User · Answer

You can use    public static final String HELLO    hello     if you have many string constants  you can use external property file   simple   constant holder  class

User · Answer

Or another typical standard in the industry is to have a Constants java named class file containing all the constants to be used all over the project

User · Answer

We usually declare the constant as static  The reason for that is because Java creates copies of non static variables every time you instantiate an object of the class      So if we make the constants static it would not do so and would save memory   With final we can make the variable constant   Hence the best practice to define a constant variable is the following   private static final String YOUR CONSTANT    Some Value      The access modifier can be private public depending on the business logic

User · Answer

public static final String YOUR STRING CONSTANT

User · Answer

It would look like this   public static final String WELCOME MESSAGE    Hello  welcome to the server     If the constants are for use just in a single class  you d want to make them private instead of public

User · Answer

Typically you d define this toward the top of a class   public static final String WELCOME MESSAGE    Hello  welcome to the server     Of course  use the appropriate member visibility  public private protected  based on where you use this constant

User · Answer

simply use  final String WELCOME MESSAGE    Hello  welcome to the server     the main part of this instruction is the  final  keyword

[java] Defining constant string in Java?

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