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Understanding Arrays: A Guide to Efficient Memory Management

Learn how arrays work as contiguous memory structures, how to create and manipulate them in computer programming, and unleash their power with loops. Master the art of arrays for better data organization and processing.

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Understanding Arrays: A Guide to Efficient Memory Management

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  1. Why arrays are cool By mr. Hanley 4/25/2007

  2. Contiguous memory structures • An array is a contiguous region of memory dedicated to storing a group of items • Lots of times in computer programming, we need to keep track of a group of items

  3. Here is an array of 9 integers called golfScores

  4. But how do I create and use an array? • int[] golfScores = new int[9]; • This command creates a new array of 9 variables • golfScores[0] = 5; //this sets the first element in the array to 5

  5. The array starts off with all values initialized to 0

  6. Now, we will overwrite the first element with a 5.

  7. Can’t we use loops with arrays? • Of course • Looping and arrays are a powerful combination • Better than Batman and Robin! • int i=0;while(i<9) { golfScores[i] = -1; i=i+1;}

  8. Now, we will overwrite all elements with -1

  9. This is sick, can I create an array of anything else? • Sure • Here is an array of 10 appointments: • String [ ] appts = new String[ 10 ];

  10. How do we access any element? • sc.println(“Which appointment to change?”); • int which = sc.input.readInt(); • appts[which] = sc.input.readLine();

  11. But I want to print all the appointments to the screen • NP • for(int i=0; i < appts.length; i++){ sc.println(i + “ “ + appts[i]);} • That’s it, you’re kidding! • No, I’m not • Truly Sick!!

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