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Editorial Team
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Asked: 2026-06-11T15:01:49+00:00

Why we use public static final declaration of instance variables in a Java Interface?

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Why we use public static final declaration of instance variables in a Java Interface?
All the variables are implicitly public static final in a Java Interface.
Is it a good coding practice to use public static final in constant variable although it is declared inside an Interface.

For example :

public interface TestInterface{

public static final String EX_CONSTANT = "ABC";
public static final int EX_INT_CONSTANT = 5;
public static final double EX_DOUBLE = 5.0;
public static final Integer EX_INTEGER = 10;

}
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1 Answer

  1. Editorial Team

    Use of uniform syntax in both classes and interfaces simplifies refactoring.

    You may want to turn your interface into a class somewhere in future, or move these fields into a class, and you’ll get a semantical difference if you overlook some fields defined without public static final (of course, we have tools for refactoring, but nonetheless).

    I think it’s the same thing as support of @Overriden annotation for implementations of methods declared in interfaces that was introduced in Java 6 – it’s redundant in its current form, but may become useful in case of refactoring.

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