Chương trình đúng hay sai ?interface A {public void aMethod();}class B implements A{@Overridepublic void aMethod() {}}class C extends B implements A{}

Question

Chương trình đúng hay sai ?

interface A {
    public void aMethod();
}

class B implements A {
    @Override
    public void aMethod() {
    }
}

class C extends B implements A {
}

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Solution

The provided code snippet is syntactically correct in Java, and it adheres to the principles of interfaces and class inheritance. Here's the breakdown:

Interface Declaration: The interface A is declared correctly, including the method aMethod().
Class B Implementation: Class B implements the interface A and provides an implementation for the aMethod(). The use of the @Override annotation indicates that B is correctly overriding the method defined in the interface.
Class C Extension: Class C extends class B, which means it inherits the implementation of aMethod() from class B. Since C also implements the interface A, it is not strictly necessary for C to redefine aMethod() unless a specific implementation is required.

Conclusion

The provided code is correct, and it correctly implements the interface and class structure in Java. The program is valid and compiles without errors.

Final Answer: The program is correct.

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Chương trình đúng hay sai ?interface A {public void aMethod();}class B implements A{@Overridepublic void aMethod() {}}class C extends B implements A{}

Question