4.3 Week 3 - Strings, Comments, & Statements

4.3 Week 3 - Strings, Comments, & Statements

4.3.1 Reading and Web Sites

1. Finish reading van der Linden Chapter 3, Explanation of a Simple Program
2. Read van der Linden Chapter 4, Identifiers, Keywords, and Types
3. Start on van der Linden Chapter 5, Names, Arrays, Operators, and Accuracy
4. Run the sample program p66 in van der Linden.

4.3.2 Notes

• String and overloaded operator + and +=
• Comments -- /* comment /*
// comment
• javadoc
  • javadoc program
  • javadoc comments /**
  • javadoc tags
    • @see
    • @author
    • @version
    • @pram
    • @return
    • @exception
    • @deprecated
  • html
• Naming convention -- References and variables start with lower case
  Objects start with Upper case letters
• Statements
  • Code block { and }
  • if( conditional ), requires boolean
  • while( conditional ) statement;
  • do statement ; while( conditional );
  • for( initialization ; conditional ; incrementer ) statement ;
  • switch and case
  • break and continue
  • labels
  • Exceptions
    • try block
    • catch( exception ) block
    • finally block

4.3.3 Lab Assignment - Exception and Integer overflow

1. enters a for loop from -3 to +3 and prints out 10 divided by the loop counter. Catch the ArithmeticException and print out "Divide by zero"
2. A section of code that demonstrates that two's complement overflow fails to cause an exception

4.3.4 Lab Assignment - "rewrite" and restructure the example program

• Scroll the text only horizontally.
• Scroll the text in a rectangular frame.
• Scroll each message only once.
• Place a rectangle around the inside of the frame of a different varying color than the text.
  See: drawRect(int x, int y, int width, int height)
  in java.awt.Graphics
• Use no constants in the code. For example:
  static final int width = 600;
  and
  for( i=0; i<msg.length; i++)
  Note: my constants were border, banner_height, y, width, height, max_string_width, & char_height
• Comment the code for readability.

Turn in a copy of your program and an show me a sample run.

4.3 Week 3 - Strings, Comments, & Statements