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Q:

What is Marker Interface?

Answer

An interface without having any methods and by implementing that interface if our objects will get same ability such type interfaces are called marker interface (or) ability interface (or) tag interface

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Subject: Java
Job Role: IT Trainer

Q:

Inside an interface when should the variables be initialized?

A) Globally B) Whenever required
C) Inside a function D) During the time of declaration
 
Answer & Explanation Answer: D) During the time of declaration

Explanation:

They should be initialized during the time of declaration itself otherwise it is a compilation eror

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Q:

Which of the following statements are equal for a variable declared in the interface ?

1. int X=10
2. public int X=10
3. public static final int X=10

A) Only 1 and 2 are equal B) Only 2 and 3 are equal
C) All are unequal D) All are equal
 
Answer & Explanation Answer: D) All are equal

Explanation:

All the statements are equal because inside an interface a variable declared will be public static final by default 

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Q:

Why interface method is always public?

Answer

To make this method available to every implementation class

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Subject: Java
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Q:

Which of the following method declarations are allowed inside interface?

A) public void m1() B) private void m1()
C) protected void m1() D) abstract public void m1()
 
Answer & Explanation Answer: D) abstract public void m1()

Explanation:

Inside an interface every method will be by default abstract and public

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Q:

X implements Y extends Z

A) X can be class Y,Z are interfaces B) X is an interface Y,Z are classes
C) X,Y are classes Z is an interface D) Complilation error
 
Answer & Explanation Answer: D) Complilation error

Explanation:

It is a compilation error it should be X extends Y implements Z

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Q:

X implements Y, Z

Arguments:

1. X should be class
2. Y, Z should be interfaces

A) Only 1 is true B) Only 2 is true
C) Both 1 and 2 are true D) None
 
Answer & Explanation Answer: C) Both 1 and 2 are true

Explanation:

Both the statements are true 

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Q:

Which of the following are valied?

A) A class can extend any number of classes simulteneously B) A class can implement only one interface at a time
C) A class can extend other class or can implement interface but not both simulteneously D) None of the above
 
Answer & Explanation Answer: D) None of the above

Explanation:

A is wrong because a class can extend nly one class .B is wrong because a class can implement any number of interfaces.C is wronb because both can can be done simulteneously.So, D is correct

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Filed Under: Java
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