Core Java - Interview Questions and Answers for 'Abstract methods' | Search Java Interview Question

Core Java - Interview Questions and Answers for 'Abstract methods' - 7 question(s) found - Order By Newest

Q1. what will be the output ?

class Animal {
public void eat() throws Exception {
}
}

class Dog2 extends Animal {
public void eat(){}
public static void main(){
Animal an = new Dog2();
an.eat();
}
}

Core Java

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Ans. Compile Time Error: Unhandled exception type Exception

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Q2. Will this code compile ?

public class BuggyBread1{
abstract public void test();
}

Core Java

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Ans. No. It will give the compilation error saying "The abstract method test in type BuggyBread1 can only be defined by an abstract class".

We need to declare the class abstract for it to have any abstract method.

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Q3. Will this Code compile ?

abstract public class BuggyBread1{
abstract public void test(){};
}

Core Java

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Ans. No. This will give a compilation error saying "Abstract methods do not specify a body".

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Q4. Can we overload abstract methods ?

Core Java

^{2017-03-01 09:43:18}

Ans. Yes

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Q5. Can we override abstract methods ?

Core Java

^{2017-03-01 09:45:08}

Ans. Abstract methods are the methods that need to be overridden in the derived class ( either as implementing method or again abstract method ) so it's not only allowed but its required to override abstract method in the derived class.

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Q6. Can we override an abstract method with abstract method in the derived class ?

Core Java

^{2017-03-01 09:46:35}

Ans. Yes, but in that case the derived class itself should be abstract. We cannot have an object of a class without definition for the method which has been declared abstract in the parent.

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Q7. Which of the following is not true for abstract classes ? Reference

Core Java

a. Abstract Class is only meant to be sub classed and not supposed to be instantiated.

b. Abstract class handlers can be used to handle derived class objects.

c. We can't have an abstract class without abstract methods.

d. Abstract class has member elements.

Ans.c. We can't have an abstract class without abstract methods.

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