Exercises0.md

Exercises

1. Bookmark References

   Bookmark the following sites for future reference:
   Groovy homepage
   Groovy API
   Groovy JDK
   Java SE6 API

2. Number Data Types

   a. What data type is the number 2? How about 20? 200? Keep adding zeros and watch the data type change until it reaches BigInteger. Then do the same for 2.0.

   b. Declare a variable x of type def and assign it the sum of 1 and 1.5. What is the resulting data type?

   c. What do you get when you divide 5 by 2? What is the resulting data type? If you wanted to do integer division (no remainder), what method would you call?

3. Wrapper Classes

   From the associated wrapper classes, find the min and max values for the Java primitives: byte, short, int, long, float, double.

4. 2s Complement

   Create a byte variable with its maximum value. What do you get when you add 1 to it?

5. Strings and GroovyStrings

   a. How many characters are in the string "Hello, Groovy!"?

   b. Define a string variable containing a name. Print a hello statement with your name using string concatenation, then using a Groovy string.

   c. Demonstrate that "racecar" is a palindrome by comparing it to its reverse. Do the same with "Bob", removing case sensitivity first.

   d. Define a string variable containing the sentence, "Hello, World. How are you?". Split the sentence into an array using the split method. Count the number of words. Do the same using the tokenize method.

   e. Using the same sentence, use array notation (square brackets) to print the substring "World".

   f. Use array notation to print the last word, but reversed.

6. Prime Numbers

   Write a method called isPrime that takes an integer argument and returns a boolean. Determine whether the number is prime by dividing it by all numbers from 2 up to one less than the number.

   That limit is too high, of course. How high do you have to check to be sure whether you've gone far enough?