AP CSA Inheritance (9.5, 9.6, 9.7)

• Line 1 will cause an error because the type used to declare arr and the type used to instantiate arr are different.

• Line 3 will cause an error because the type used to declare t2 and the type used to instantiate t2 are different.

• Line 5 will cause an error because the types of arr[0] and t1 are different.

• Line 6 will cause an error because the types of arr[1] and t2 are different.

• Line 7 will cause an error because the types of arr[2] and t3 are different.

Which of the following best explains why the code segment will not compile?

• Line 3 causes a compile-time error because the Refrigerator class is missing the display() method.

• Line 6 causes a compile-time error because the variable a1 is incorrectly instantiated.

• Line 7 causes a compile-time error because the variable a2 is incorrectly instantiated.

• Line 8 causes a compile-time error because the parameter a1 in the call displayFeatures(a1) has the incorrect data type.

• Line 9 causes a compile-time error because the parameter a2 in the call displayFeatures(a2) has the incorrect data type.

• Line 3 causes a compile-time error because the variable sec should be declared as type Second.

• Line 4 causes a compile-time error because the variable thr should be declared as type Third.

• Line 3 causes a compile-time error because the Second class is missing the output1 method.

• Line 3 causes a compile-time error because the Second class is missing the output2 method.

• Line 4 causes a compile-time error because the Third class is missing the output method.

• Line 2 causes a compile-time error because the variable tool1 is declared as type MultiTool but is instantiated as a DeluxeMultiTool.

• Line 3 causes a compile-time error because the variable tool2 is declared as type MultiTool and is instantiated as a DeluxeMultiTool.

• In line 4, tool2 cannot be added to the ArrayList because it was instantiated as a DeluxeMultiTool.

• In line 5, tool2 cannot be added to the ArrayList because it was declared to be of type DeluxeMultiTool.

• Line 8 causes a compile-time error because the getCompass method is not defined for objects of type MultiTool.

• The variable thing should be declared as a Bclass data type because thing is instantiated as a Bclass object.

• The variable thing should be instantiated as an Aclass object because methodY is overridden in Bclass.

• The method methodX should be removed from the Aclass definition because methodX is overridden in Bclass.

• The method methodY should be removed from the Aclass definition because methodY is overridden in Bclass.

• The method methodZ should be overridden in the Bclass definition because methodZ appears only in Aclass.

Which of the following code segments, when executed in a class other than Vehicle or Motorized, will display Number of Wheels: 4 Max Speed: Fast ?

• Vehicle obj = new Vehicle(55);

  System.out.println(obj);

• Vehicle obj = new Vehicle(55);

  System.out.println(toString(obj));

• Motorized obj = new Motorized(55);

  System.out.println(obj);

• Vehicle obj = new Motorized(4, 55);

  System.out.println(obj);

• Motorized obj = new Motorized(4, 55);

  System.out.println(toString(obj));

• s1.equals(s2)

• s2.equals(s3)

• s3.equals(s4)

• s4.equals(s5)

• s5.equals(s1)

• I only

• II only

• III only

• I and II

• I and III