Exams 2 Preparation CS 101 & 101-E

Test preparation

The exam from last semester is available at available

The quiz from last semester is available at available

Try to solve the following three exercises. The solutions will be considered in lecture on Monday. They will not be considered anywhere else. These exercises will be very similar in nature to actual exam questions, so why not be prepared and practice now.

The Tune class

Give Java definitions for a Tune default constructor and Tune instance method sameArtist(), where Tune is class for representing an audio track. The representation maintains the following four attributes :

• private String artist
  • Performer of the piece
• private String title
  • Name of the track
• private String album
  • Name of the compilation on which the tune appears
• private int length
  • Performance time in seconds

Some of the methods provided by the class are as follows:

• public Tune()
  • Configures the Tune to represent the first recorded album which was a single-track 15-second recital of the poem Mary Had a Little Lamb by Thomas Alva Edison in 1877. A 1927 re-enactment by Edison remains available
• public Tune( String performer, String name, String compilation, int seconds )
  • Configures the Tune so that performer is the credited artist; name is the title of the track, compilation is the name of the album, and seconds is the length of the track
• public boolean sameArtist(Tune that)
  • Returns whether this and that tune are recordings by the same performer
• public boolean sameLength(Tune that)
  • Returns whether this and that tune have the same performance time

Some of the other methods provided by the class are attribute accessors and mutators as follows:

• public String getArtist()
• public String getTitle()
• public String getAlbum()
• public String getTime()
   
• public String setArtist( String performer )
• public String setTitle( String name )
• public String setAlbum( String compilation)
• public String setTime( int seconds )

Mutators setArtist(), setTitle(), and setAlbum() display an error message if the new value of the attribute is null or represents the empty string "".  Mutators setTime( seconds ), if the modified track time is less than 1 second.

Exercise 1

As a warm-up for the Wednesday test give Java definitions for the Tune default constructor and Tune instance method sameArtist() .

Exercise 2

Give a memory diagram for the following code snippet.

Tune t1 = new Tune();
Tune t2 new Tune( "Neil Young", "I Am the Ocean". "Mirror Ball", 428);

Exercise 3

Update your memory diagram from the second exercise so that it also includes the initial activation record depiction of sameArtist() for the following invocation

t1.sameArtist(t2)