WEEK 2

• Review HW
  • Talk about O(…)
  • Have someone show solution
• Quiz?

Classes

• Objects
• Abstract data types
• Members
  • Private, public
• Methods
  • Invoking, sending a message
  • Accessor (read, test), Modification
  • Private, public
• Constructors
  • With, without parameters, overloading
• Creating new objects
  • Reference variables
  • Null references
  • Assignment statements
  • Show picture of two object references pointing to same thing vs. different
  • Definition of “equals”
  • Testing equality
    • == what it does
    • write a method to test var.isequal(var2);
• Accessing members and invoking methods

Packages

• Using Netbeans
• Using
  • Import package.*

Static Methods

• A class method, not an object method
• E.g. Location.distance(p65-66);

Parameters

• Call by value
• Call by reference
• Objects as parameters
• Parameters vs. arguments
• What happens in methods to these
   

Return values

• Value, reference
• Objects as return values
   

The Object type

• A “super type” of objects
• Test a parameter
  • E.g. equals(Object obj)
  • (obj instanceof Class)
  • then need to cast to use:  e.g. Class var = (Class) obj;
  • see p. 76

Introduce Finite State Machines

• Example of three-way light switch
• Example of simple radio (buttons for 2 stations and set)
• implementing using switch statements