What happens if we does not initialize variables of an interface in java?

In Java final is the access modifier which can be used with a filed class and a method.

  • When a method if final it cannot be overridden.
  • When a variable is final its value cannot be modified further.
  • When a class is finale it cannot be extended.

Declaring final variable without initialization

If you declare a variable as final, it is mandatory to initialize it before the end of the constructor. If you don’t you will get a compilation error.


In the following java program, we a have an interface with a public, static, final variable with name num and, a public, abstract method with name demo.

public interface MyInterface {
   public static final int num;
   public abstract void demo();

Compile time error

On compiling, the above program generates the following error.


MyInterface.java:2: error: = expected
   public static final int num;
1 error

Updated on: 29-Jun-2020

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