APCS unit 9

What is inheritance in Java?

• A way to grant permissions to files

• A technique to secure web applications

• A process where new classes are derived from existing classes

• A method to increase the efficiency of database access

What does polymorphism allow in Java?

• Creating multiple variables of the same name within the same scope

• Connecting to different databases using the same interface

• Encrypting data to enhance security

• Changing the behavior of an application based on the type of object

What is the purpose of constructors in Java?

• To encrypt user data for security

• To terminate applications cleanly

• To initialize new objects

• To create a new thread for multitasking

How many superclasses can a Java class have?

• None

• As many as needed

• Two

• One

What modifier makes a member of a class not inheritable?

• static

• protected

• private

• public

What keyword is used to inherit a class in Java?

• uses

• inherits

• extends

• implements

What can be done with static methods in terms of inheritance?

• They can be overridden

• They can be hidden

• They can be overloaded

• They cannot be used

What is true about private methods in Java?

• They cannot be truly overridden

• They can be inherited

• They can be overridden

• They can be accessed from any class

What relationship exists between a subclass and its superclass?

• Implements-a relationship

• Uses-a relationship

• Has-a relationship

• Is-a relationship

What is true about constructors and inheritance?

• Constructors are inherited

• Only parameterized constructors are inherited

• Constructors are not inherited

• Only default constructors are inherited