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Java-Lab-002

Variables, Types and Operators

Be able to explain what variables are. Understand variable types, allowed names, and valid values. Know how to create and use string, integer, floating-point, and boolean variables.

Part 1 - PricelessScript.java - MasterCard YouTube Ad

The lab template contains a program that prints the following:

2 tickets: $28.00
2 hotdogs, 2 popcorn, 2 sodas: $18.00
1 autographed baseball $45.00
real conversation with 11 year old son: priceless
true

Ignore the code that you don't fully recognize and concentrate on changing the variables to alter the MasterCard Priceless script to say:

3 tickets: $42.00
3 hotdogs, 3 popcorn, 3 sodas: $27.00
2 autographed baseball $90.00
watching the Giants win: priceless
false

Part 2 - Interpretation

Take note of the various variables and their data types. Write a brief summary in this section of the README.md file listing the:

  • Variable name
  • Its data type
  • and example values you can assign them.
Name Type Example(s)
scriptTemplateLine1 String "Hello!"
scriptTemplateLine2 String "world!"
scriptTemplateLine3 String "There are"
scriptTemplateLine4 String "5"
priceless String "strings in this file."
people int 5, 2, -3
ticketPrice float 3.2f, -5.0f, 82.25f
itemPrice double 52.34, 0.0, Double.MAX_VALUE
trueOrFalse boolean True, False
formatter NumberFormat NumberFormat.getCurrencyInstance()

Next give TWO example variable names and TWO example variable assignments that are WRONG and explain why.

  • Hint: your IDE can help you discover these!
Name Type Example(s) Explanation
badInt int "3" Java does not automatically convert strings to ints.
badFloat float 0.0 When not given the 'f' at the end, floating point values are seen as doubles by Java. Attempting to run this will give you a compile-time error.

Part 3 - Bonus: Play around with Java String Format Specifiers.

Pick several of the Java format specifiers below and define variables of the correct type utilize sout and String.format to view the resulting formats.

Format Specifiers

Part 4 - Submission

  • Commit your working code
  • Push it to your Remote/origin branch (i.e. GitHub)
  • Then issue a Pull request to the instructor branch
    • Make sure to save the Pull request URL and submit it for the lab.