AP Computer Science Homework Set 9 Classes and Constructors

P9E. Modify the TV class (P8C) to include a one-argument constructor for a TV.The argument for the constructor should be a Boolean representing whether or not theTV is on. Make the proper modifications in the HDTV and BWTV classes so thatmay use the one-argument constructor defined in TV. Finally, modify the TVDriverso that instances of an HDTV and BWTW objects are instantiated using the oneargumentconstructor. The output should be the same as in program P8C.By the end of the lesson students should be able to:a. State that method invocations and local variables are stored on the stack and that objects andits instance variables are stored on the heap.b. Explain why the heap is also known as the “Garbage Collectible Heap”.c. Write the Java code to construct an object using the keyword “new” (i.e. write a zeroargument AND one or more argument constructor for an object.)d. Write the Java code for overloaded object constructors.e. Explain that a programmer needs to explicitly write a zero argument constructor if a one ormore argument constructor is written by the programmer.f. Explain that every constructor up an inheritance hierarchy is run at the time an object of asubclass is created.g. Write the Java code to invoke an object’s superclass constructor (with no arguments or withone or more arguments.)h. Write the Java code to invoke an overloaded constructor from another constructor using thekeyword “this”.i. Explain the difference between life and scope for local variables.j. Explain the three ways to eliminate an object’s reference (i.e. make it eligible for GC.)Page 2AP Computer Science – HW Set 9 Programshttp://thecubscientist.com