Ivor Horton's Beginning Java™ 2, JDK™ 5th Edition

4.6. Exercises

You can download the source code for the examples in the book and the solutions to the following exercises from http://www.wrox.com.

1. Create an array of String variables and initialize the array with the names of the months from January to December. Create an array containing 12 random decimal values between 0.0 and 100.0. Display the names of each month along with the corresponding decimal value. Calculate and display the average of the 12 decimal values.

2. Write a program to create a rectangular array containing a multiplication table from 1 * 1 up to 12 * 12. Output the table as 13 columns with the numeric values right-aligned in columns. (The first line of output will be the column headings, the first column with no heading, then the numbers 1 to 12 for the remaining columns. The first item in each of the succeeding lines is the row heading, which ranges from 1 to 12.)

3. Write a program that sets up a String variable containing a paragraph of text of your choice. Extract the words from the text and sort them into alphabetical order. Display the sorted list of words. You could use a simple sorting method called the bubble sort. To sort an array into ascending order the process is as follows:

   1. Starting with the first element in the array, compare successive elements (0 and 1, 1 and 2, 2 and 3, and so on).

   2. If the first element of any pair is greater than the second, interchange the two elements.

   3. Repeat the process for the whole array until no interchanges are necessary. The ...