Reading:

• Chapter 8, Sections 8.1-8.3, 8.5

8.2. Arrays

These array examples are written for Java but should work in Processing as well provided that you replace public static void main() with void setup() .

Focus your attention on the basic arrays material in Sections 8.2.1-8.2.2, declaring, initializing and using arrays. After you’ve read through these sub-sections, try the following exercises:

• Consider the following code segment:

  int[] test = new int[5];       // 1. Draw a picture of the memory structure created by this statement.
  System.out.println(test);      // 2. Can you explain the output you get here? 
  // 3. Add a statement here to print out the first element of the array. What is its value and how did it get this value?
  System.out.println(test[5]);   // 4. Explain what this does and why?
  						

  Do all the things specified in these comments.
• Write a code segment that declares an array of integers of size 100 and uses a for loop to fill its elements with the integers 1 through 100.
• Write a program that declares an array of 4 string values and initializes its element values (say to “Sleepy”, “Doc”, “Grumpy”, and “Happy”). Now, add a statement that prints all the values in the array, no matter how large the array is, that is, you should be able to add another array value in the calling program (say “Dopey”)and have your code still work properly.
• Write a method that receives an array of integers and adds 1 to each array element. The method should not return anything, but the values in the array argument in the calling program should be changed when the method is finished.
• How would you modify the program you just wrote so that it would continue to add 1 to the array values but that the array would remain unchanged in the calling program? For this, you’ll need to understand the material in Section 8.2.3 - Array Cloning.

8.3. Array Topics: Search

When you’ve read this section, try to modify the linear search program to receive an array of Strings and search for a string target value.

8.4. Files

Skip this section on Processing file Input/Output (I/O); we’ll address Java file I/O later in the course.

8.5. Multi-dimensional Arrays

We won’t use the material in this section immediately, but read through it to get an idea of how multi-dimensional arrays can be used.