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  • Functional Interface - Java 8

    @babita.dhami
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    The interface with only a single methods is known as functional interface. If an interface marked as @FunctionalInterface it can only contains one abstract method. If we try to declare more than one abstract method inside FunctionalInterface compiler will produce the error.

    For example -

    1. @FunctionalInterface
    2. public interface MyDemoFunctionalInterface {
    3.  public abstract void display();
    4. }

    The above example is correct and will compile successfully, but the below example cannot be compiled and will throw the error:

    1. @FunctionalInterface
    2. public interface MyDemoFunctionalInterface
    3. {
    4.   public abstract void display();
    5.   public abstract void show();
    6. }

    Hope this will help you :)

    Java 8 @FunctionalInterface
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