OBJECT REFERENCES EXAMPLE

1.  Consider the following code:

    int w = 10;
    int c = 5;

    w = w - 1;
    c = c + 1;
    w = w - 1;

    System.out.println(w);
    System.out.println(c);

    // a) What is output here?

    c = w;

    w--;
    c++;
    w--;
    
    System.out.println(w);
    System.out.println(c);

    // b) What is output here?

Suppose we have a Student class.  Every Student object has an energy level.  A 
Student can do two activities: she can study, which decreases her energy level 
by one, or he can drink beer, which increases his energy level by one.  When we 
make a new Student, we specify her energy level.  Each student can also complain, 
i.e., report his energy level.

2.  Consider the following code:

    Student wade = new Student(10);
    Student carl = new Student(5);

    wade.study();
    carl.drinkBeer();
    wade.study();

    wade.complain();
    carl.complain();

    // a) What is output here?

    carl = wade;

    wade.study();
    carl.drinkBeer();
    wade.study();

    wade.complain();
    carl.complain();

    // b) What is output here?

3.  What differentiates objects and primitives?