Lecture 3

We finished up the definition of the card classes from last class and discussed briefly the following:

• Objects are represented as references and assignment is sharing. Use "equals" rather than "==" for equality.
• Parameter passing: Parameters are passed by "sharing". Sending messages to objects can change their internal state. Assigning to a formal parameter is discouraged as it has no impact on the actual parameter and you lose the sharing.
• How to use Random with the LottoHelper program:
  • LottoHelper.java
• Standard Java graphics. See the handout for details and examples.
• Handling exceptions in Java
• Packages and information hiding