LAB EXERCISES

Figure $1$ depicts the classes to which you will interface while completing the exercise.

In class Singer,:

a$.$ Complete the first constructor that accepts name, genre, budget, as well as a reference to

the Ministry$($incoming arguments include $n$ for the name, $g$ for genre, and $b$ for budget$).$

b$.$ Implement the second constructor so that ALL instance variables are initialized.

In class Song, write the calculation in method getEstEarnings of class Song to evaluate estimated

earnings. Note that while in the real world, other methods would be used to estimate earnings, in

this simplified model, the estimated earnings will be the length of the song title, multiplied by the

Ministry's songPartEst$($hint$..$ the singer keeps a reference to the ministry. You can observe how the

reference is used in method getClaimableEarnings$).$

In class Singer, correct the method sumEstEarnings to evaluate the sum of estimated earnings for the

singer$.$

Record a song in a studio and try to register the song

a$.$ Write a mutator in class Song named setStudio$($Studio studio$)$ that accepts a Studio, and sets

the associated studio on the song to the referenced Studio.

b$.$ In method tryToRegisterSong of class Singer, so that if the Singer has a favourite Studio, and

the Studio is available, set the Studio on the Song to the favourite Studio.

Update logic in method tryToRegisterSong of class Singer to check if artist can afford the desired

studio before setting the studio on the song.

Update logic in method tryToRegisterSong of class Singer to allow ministry to suggest a studio by

calling the method getBestAvailableStudio$($int budget, Studio preferred$)$ from Ministry, which returns

a suggested studio. If the method returns a studio $($returned value is not null$)$ then set the studio for

the song to the returned studio if the singer is able to afford it$.$ Add a song to the list of registered

songs only if the song is linked to a studio.

Update logic in method tryToRegisterSong of class Singer to ensure singer$\text{'}$s budget is reduced by the

cost of the studio if registration is successful.

Update logic in method tryToRegisterSong of class Singer to ensure the Studio has a record of the

Song after registration, by calling the Studio's reserve method, with the Song as an argument.