Medium Multiple Choice Questions on Inheritance

Given the following class declarations, what is the output from Student s1 = new GradStudent(); followed by s1.getInfo();?

• Won't compile since GradStudent doesn't have a getInfo method

• Taco

• Pizza

• Won't compile since you are creating a GradStudent, not a Student

• Won't compile since you use this.getFood()

Given the following class declarations, and EnhancedItem enItemObj = new EnhancedItem(); in a client class, which of the following statements would compile?

• I only

• II only

• I and II only

• II and III only

• I, II, and III

Given the following class declarations and initializations in a client program, which of the following is a correct call to method1?

• t1.method1(t1,t1);

• t2.method1(t2,t2);

• t3.method1(t1,t1);

• t2.method1(t3,t2);

• t3.method1(t3,t3);

If you have a parent class Animal that has a method speak() which returns: Awk. Cat has a speak method that returns: Meow. Bird does not have a speak method. Dog has a speak method that returns: Woof. Pig does not have a speak method. Cow has a speak method that returns: Moo. What is the output from looping through the array a created below and asking each element to speak()?

• Meow Moo Woof Awk Awk

• Awk Awk Awk Awk Awk

• This will not compile

• This will have runtime errors

• Meow Moo Woof Oink Awk

Given the following class declarations and code, what is the result when the code is run?

• The code compiles and runs with no errors, the output is 5 6 5 6

• The code compiles and runs with no errors, the output is: 5 6 10 11

• The code compiles and runs with no errors, the output is 10 11 10 11

• The code won't compile.

• You get a runtime error ClassCastException, when fastCar.addFuel() is executed.

Given the following class declarations and code, what is the result when the code is run?

• I only

• II only

• I and III only

• III only

• I, II, and III

What is the output of the following code?

• Meow Screeech Lasagna

• Screeech Meow Lasagna

• Lasagna Meow Screeech

• Lasagna Screeech Meow