Midterm Topics

This is a list of the topics we have covered so far. The midterm questions can come from any of these. Read over the notes and review the readings mentioned in them (if any). Study the example code.

• Variables
  Know the four properties of a variable, name, type, location and contents. Know the different data types, int, float char boolean etc. Know that object variables (instances of a class) don't really exist until you use new.
• Control Flow
  If statements with and without else. For, while and do loops.
• Functions
  Functions can be used wherever a variable of the return type can be used.
• Expressions
  Know the different operators ( <, >, >+, <=, != ) know the logical operators ( !, &&, || ) How to combine them. What is true and what is false?
• Arrays
  Now how to declare and use one dimensional arrays. Array elements are all the same size. Arrays cannot be expanded. Creating an array and creating the objects in it are different things. See the flashlight code.
• Classes
  Know the syntax of them. How to use public and private markers. How to create a main() method. Name of class must be the same as the name of the file.
• Java
  Source code in .java files.
  java file.java
  to compile and
  javac file
  to run. Source files compiled to .class files. .class files can be run by any Java system on any OS.
• Stuff
  Applications have a main and are run by themselves. Applets run in a web browser. Everything is an object. Class heirarchy starts with Object. Single inheritance.