Computer Science APEA 15-100, Summer 2009
Lab 12

Read these instructions first!

• The homework collaboration policy does not apply to labs.  In labs, you may work alone or in small groups.  And you may show each other your code, and help each other in any manner.  This is encouraged, in fact!
   
• That said, the participation policy is still in effect -- you must not only attend labs, but actually work during the labs.  If you have completed the assigned work, then you should either help others, if they request it, or you should delve deeper into the assigned material.   But you must use the lab time exclusively to explore the material covered in that lab.
   
• In particular, you may not use lab time to do your homework.
   
• There is nothing to submit for labs.

Implement the missing portions of TelevisionDemo.java so that it passes all the test cases.  Here is the code from TelevisionDemo.java:

// TelevisionDemo.java
// <NAME, ANDREW ID, SECTION>

// Do not modify the TelevisionDemo main class.  Make this code work
// by adding the appropriate classes with the appropriate methods as
// described by the test methods called by the main method.

// Note that you do not have to add any code to the test cases, though
// you do have to solve them with general-purpose solutions (and not just
// hard-code the example test cases!).

// Hint: to solve this incrementally, you may wish to comment out
// parts of the test code so the parts you have implemented will compile
// and can be tested as you go.

public class TelevisionDemo {
  public static void main(String[] args) throws Exception {
    testTelevisionClass();
  }

  //////////////////////////////////
  // testTelevisionClass
  //////////////////////////////////

  private static void testTelevisionClass() {
    System.out.print("Running Television class tests...  ");
    // default constructor:
    Television tv1 = new Television();
    assert(tv1.getStation() == 4);  // default station is channel 4
    assert(tv1.getVolume() == 3);   // default volume is 3 (min = 0, max = 10)
    assert(tv1.isMuted() == false); // default is not muted

    // getStation + setStation:
    tv1.setStation(23);             // legal stations in range [1,999]
    assert(tv1.getStation() == 23); // we just set it!
    tv1.setStation(-1);             // -1 is <=0, illegal station, has no effect
    assert(tv1.getStation() == 23); // -1 was illegal, had no effect
    tv1.setStation(999);
    assert(tv1.getStation() == 999);
    tv1.setStation(1000);           // too large, has no effect!
    assert(tv1.getStation() == 999);

    // getVolume and setVolume:
    tv1.setVolume(0);               // min legal value
    assert(tv1.getVolume() == 0);
    tv1.setVolume(-1);              // too small, no effect!
    assert(tv1.getVolume() == 0);
    tv1.setVolume(11);              // too large, no effect
    assert(tv1.getVolume() == 0);

    // isMuted and setMuted
    tv1.setMuted(true);
    assert(tv1.isMuted() == true);
    tv1.setMuted(false);
    assert(tv1.isMuted() == false);

    // toString
    assert(tv1.toString().equals("tv<station=999,volume=0,muted=false>"));

    // second instance, using a different constructor
    Television tv2 = new Television(5,6,true); // station, volume, isMuted
    assert(tv2.getStation() == 5);
    assert(tv2.getVolume() == 6);
    assert(tv2.isMuted() == true);
    assert(tv2.toString().equals("tv<station=5,volume=6,muted=true>"));

    // independence of two instances
    assert(tv1.getStation() == 999);
    assert(tv2.getStation() == 5);
    tv1.setStation(11);
    tv2.setStation(22);
    assert(tv1.getStation() == 11);
    assert(tv2.getStation() == 22);
    System.out.println("Passed all tests!!!");
  }
}

//////////////////////////////////
// Television class
//////////////////////////////////

class Television {
  // ADD CODE HERE!!!
}

Carpe diem!