CSC703_T3_Milestone2_PC2.1_2.9_P_ID

1. PC2.1: Facilitate polymorphism by assigning an object of type S to a reference of type T considering S is a subclass of T.

2. Question: Which statement demonstrates the concept of polymorphism in Java?

• a) java T obj = new S();

• b) java S obj = new T();

• c) java T[] array = new S[10]; 

• d) java ArrayList<S> list = new ArrayList<T>();

1. PC2.2: Demonstrate understanding of the fact that if S is a subclass of T, then a reference of type T can be used to refer to an object of type T or S through program design and analysis.

2. Question: Which scenario illustrates the use of a reference of type T to refer to an object of type T or its subclass S?

• a) Passing an object of type S to a method that accepts an argument of type T

• b) Initializing an object of type T with a subclass S

• c) Using an object of type S where an object of type T is expected

• d) Declaring a variable of type T and assigning it to an object of type S

1. PC2.3: Declare references of type T, when S is a subclass of T, in the following declarations Formal method parameters and arrays — T[] var ArrayList<T> var.

2. Question: Which declaration correctly demonstrates the use of a reference of type T when S is a subclass of

• a) java S[] array = new T[10];

• b) java T var = new S();

• c) java ArrayList<T> list = new ArrayList<S>();

• d) java T[] array = new S[10];

1. PC2.4: Define Polymorphism as the ability of an object to take on many forms.

2. Question: How is polymorphism defined in Java?

• a) The process of converting one data type to another

• b) The ability of an object to take on many forms

• c) The process of hiding the implementation details

• d) The ability to access methods and fields of different classes

1. PC2.5: Utilize the Object class through inheritance and call methods in an inheritance relationship.

2. Question: In Java, which class serves as the superclass for all other classes and allows for inheritance relationships?

   • Answer: a) java.lang.Object

• a) java.lang.Object

• b) java.util.ArrayList 

• c) java.lang.String

• d) java.util.Scanner

1. PC2.6: Determine the behavior of a program during compile time and run time where in compile time, methods in or inherited by the declared type determine the correctness of a non-static method call while in run-time, the method in the actual object type is executed for a non-static method call.

2. Question: During which phase of program execution in Java, methods in or inherited by the declared type determine the correctness of a non-static method call?

• a) Compile time

• b) Run time

• c) Debug time

• d) Execution time

1. PC2.7: Demonstrate understanding of the fact that the Object class is the superclass of all other classes in Java and is part of the java.lang package.

2. Question: Which package contains the Object class, which is the superclass of all other classes in Java?

• a) java.util

• b) java.io

• c) java.lang 

• d) java.awt