java quiz based on interface

What will be the output of the following Java program?

• 0

• 2

• 4

• None of these

Which of these can be used to fully abstract a class from its implementation?

• Objects

• Packages

• Interfaces

• None of the Mentioned

What is the output of this program?

• a=10

• a=20

• Compilation Error

• No Error, but no output

What type of variable can be defined in an interface?

• public static

• private final

• public final

• static final

What does an interface contain?

• Method definition

• Method declaration

• Method declaration and definition

• Method name

Which of the following is correct way of implementing an interface salary by class manager?

• class manager extends salary {}

• class manager implements salary {}

• class manager imports salary {}

• None of the mentioned.

What will be the output of the following Java program?

• 0 1 2

• 0 2 4

• 0 0 4

• 0 1 4

Abstract class can have constructors and static methods?

• TRUE

• FALSE

• Abstract class can have constructors but can not have static methods.

• Abstract class can not have constructors but can have static methods.

Which of these is not a correct statement?

• Every class containing abstract method must be declared abstract

• Abstract class defines only the structure of the class not its implementation

• Abstract class can be initiated by new operator

• Abstract class can be inherited

What will be output for the following code?

• Compilation error in Line 1(abstract method cannot be private)

• Compilation error in Line 2(abstract class cannot have concrete method)

• Compilation error in Line 3(abstract class cannot be extended)

• Compilation error in Line 4(deposit method should have public access modifier)