Java-oops2

What keyword is used to define an abstract method in Java?

• static

• final

• abstract

• interface

What is the return type of an abstract method in Java?

• It can be any valid return type

• It must always be void

• It must always return an int

• Abstract methods cannot have a return type

Which of the following is true about method overloading?

• Method names must be different

• Method return types must be different

• Method overloading is not allowed in Java

• Method parameters must be different

Which of the following is an example of method overriding?

• Two methods with the same name but different parameters in the same class

• A subclass redefining a method from its parent class

• Two different classes having methods with the same name

• A method calling another method

What is required for method overriding to work properly in Java?

• The method must have the same name, return type, and parameters in the subclass

• The method must have a different name in the subclass

• The method must be static

• The method must have a different return type

What happens if a method is marked as final in a class?

• It can be overridden

• It cannot be overridden

• It becomes abstract

• It can only be accessed within the same class

In method overloading, how is the method call resolved?

• At runtime

• At compile-time

• At both compile-time and runtime

• None of the above

Which method must be implemented when a class implements an interface?

• Only the first method

• Only abstract methods

• Only static methods

• All methods declared in the interface

How many interfaces can a Java class implement?

• One

• Two

• Multiple

• None

Which class can be instantiated directly?

• Abstract class

• Interface

• Concrete class

• None of the above