Given: ``java public interface ExampleInterface { } `` Which two statements are valid to be written in this interface? (Choose two.)

Question

public interface ExampleInterface {
}

Options

• Apublic abstract void methodB();
• Bfinal public void methodA(){System.out.println("G");}
• Cpublic abstract void methodC();
• Dpublic String methodD();
• Epublic int x = 1;
• Ffinal public void methodF(){System.out.println("F");}

• A
  74% (29)
• B
  5% (2)
• C
  3% (1)
• E
  3% (1)
• F
  15% (6)

Explanation

In Java, all interface methods are implicitly public abstract, so explicitly declaring them with those modifiers (option A) is perfectly legal. Option D is equally valid - omitting abstract (or public) is allowed because the compiler adds them automatically, making public String methodD(); a valid abstract method signature.

Options B and F are wrong because final methods are not permitted in interfaces. The entire purpose of an interface is to define a contract that implementing classes must fulfill, which requires overriding - final would prevent overriding, creating a direct contradiction. These also have method bodies without the default keyword, which only became legal in Java 8 for default and static methods (never final).

Option C (public abstract void methodC()) is structurally identical to A and is arguably also valid Java - this appears to be a flaw in the question, or C was intended to use protected which is illegal (interface methods must be public). Option E (public int x = 1) is actually valid Java since interface fields are implicitly public static final, but the exam likely intends it as a distractor expecting you to flag the missing final or static keywords.

Memory tip: Think of an interface as a promise poster - you can list abstract promises (void doThis();) and declare named constants, but you cannot hang a final sign (no final methods) because someone must always be able to fulfill each promise by overriding it.

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