Java Concepts: Quiz on Key Topics

Which of the following statements about static methods in Java is true?

• Static methods can access instance variables directly.

• Static methods belong to the class rather than any object of the class.

• Static methods can be overridden in subclasses.

• Static methods can only be called from within the class they are defined in.

What is the primary purpose of an interface in Java?

• To allow multiple inheritance of implementation.

• To define a contract that implementing classes must follow.

• To provide a way to create objects.

• To store static variables.

Which of the following is a valid rule for method overloading in Java?

• Overloaded methods must have the same return type.

• Overloaded methods must have different parameter lists.

• Overloaded methods must be in different classes.

• Overloaded methods must have the same access modifier.

In Java, what is polymorphism primarily used for?

• To allow a class to have multiple constructors.

• To enable objects to take on multiple forms.

• To define multiple methods with the same name.

• To restrict access to certain class members.

Which of the following is a key difference between abstract classes and interfaces in Java?

• Abstract classes can have constructors, interfaces cannot.

• Interfaces can have instance variables, abstract classes cannot.

• Abstract classes cannot be extended, interfaces can.

• Interfaces can have method implementations, abstract classes cannot.

Which of the following is true about static methods in interfaces in Java 8 and later?

• Static methods in interfaces can be overridden.

• Static methods in interfaces are inherited by implementing classes.

• Static methods in interfaces can be called using the interface name.

• Static methods in interfaces must be abstract.

What is the result of attempting to overload a method by changing only its return type?

• The method will be successfully overloaded.

• A compile-time error will occur.

• The method will be overridden instead.

• The method will be ignored by the compiler.

Which of the following best describes dynamic polymorphism in Java?

• Method overloading.

• Method overriding.

• Using static methods.

• Using final methods.

Which of the following can an interface in Java contain?

• Instance variables.

• Constructors.

• Static methods.

• Private methods.

What is the main advantage of using method overloading in Java?

• It allows for multiple inheritance.

• It improves code readability and reusability.

• It enables runtime polymorphism.

• It restricts access to class members.