You can use an Enum if all your constants are related (like planet names), put the constant values in classes they are related to (if you have access to them), or use a non instanciable utility class (define a private default constructor).

Oct 9, 2012 · You can use an enum type in Java 5 and onwards for the purpose you have described. It is type safe. A is an instance variable. (If it has the static modifier, then it becomes a static variable.) Constants just means the value doesn't change. Instance variables are data members belonging to the object and not the class. Instance variable ...

Sep 16, 2008 · Enums are perhaps the most (and, arguably, only) useful feature of Java 5+. If you have constants that are only valid to a particular class or one of its subclasses, declare them as either protected or public and place them on the top class in the hierarchy.

Jan 8, 2024 · Let’s look at the basics for defining a constant: Some of the patterns we’ll look at will address the public or private access modifier decision. We make our constants static and final and give them an appropriate type, whether that’s a Java primitive, a class, or an enum.

Feb 26, 2025 · This comprehensive guide explains how to declare class constants in Java, highlighting their importance and providing clear examples. Learn about the benefits of using class constants, including maintainability and readability, and explore practical code snippets.

Sep 28, 2019 · Java doesn’t have a special keyword to define a constant. const is reserved keyword (you can’t use it as a name of a variable for example), but it’s unused. So to declare a constant in Java you have to add static final modifiers to a class field. Example:

To declare a constant in a class, we use the final keyword: public final int NUM_STUDENTS = 100; To declare a constant in an interface, use the static and final keywords:

In Java, there are multiple ways to declare constants: Using final keyword; Using static final for class-level constants; Using enum for a set of constant values; Example Code

To declare a class-level constant (which is the same for all instances), use `public static final`. To declare a constant that varies by instance, declare it with `public final` in the constructor.

Nov 26, 2019 · We will see two ways to Define Constants In Java: Unfortunately, many applications choose the solution of Placing constants in an interface. public static final String COMMUNICATION_EMAIL = "EMAIL"; . public static final String COMMUNICATION_PHONE = "PHONE"; . public static final String COMMUNICATION_ADDRESS = "ADDRESS";