// APS101, Winter 2009: Lecture 9 (Jan. 27)
//
// Review: last time we wrote our own class, from scratch.
// We wrote BankAccount.java.
BankAccount ba = new BankAccount("Yaroslav", "Riabinin", 100000000.0, true, 1234);
ba.getBalance()
ba.withdraw(100000000)
ba.getBalance()
ba.deposit(1)
ba.getBalance()
BankAccount ba2 = new BankAccount("Yaroslav", "Riabinin", 1235);
ba.isEqual(ba2)
ba2.isEqual(ba)
BankAccount ba3 = new BankAccount("Yaroslav", "Riabinin", 1234);
ba.isEqual(ba3)

// Today we'll be talking about class interactions.
// aggregation relation:
// When one object contains another object.
// For example, a Band has three members (Musicians).
// We wrote Musician.java.

// LOCAL VARIABLE:
// - defined within a method
// - not visible outside that method
// we've also seen another type of variable:
// INSTANCE or GLOBAL VARIABLE:
// - these variables can be seen by any method

// Testing the Musician class...
Musician m = new Musician("LilWayne", 10);
m.getName()
m.getSalary()
// Then, we wrote Band.java.
Musician m1 = new Musician("LilWayne", 10);
Musician m2 = new Musician("PDiddy", 50);
Musician m3 = new Musician("JayZ", 1000);
Band b = new Band(m1, m2, m3);
b.getTotalSalary()
(b.getMemberOne()).getSalary()
b.getMemberOne().getSalary()
// what is the toString() method?
// if you don't provide the toString() method, the default toString() method is called
// the default returns the reference to the object, in String format, like this:
Object o = new Object()
o.toString()
o
// We wrote a toString() method in Musician
Musician m1 = new Musician("LilWayne", 10);
m1.toString()
// We wrote a isEqual(Musician) method in Musician
Musician m1 = new Musician("LilWayne", 10);
Musician m2 = new Musician("Gene Simmons", 10);
m1.isEqual(m2)
Musician m3 = new Musician("Gene Simmons", 10);
m2.isEqual(m3)
m2.equals(m3)
m2 == m3