Multi-Dimensional Arrays

Submitted by GeePee on Wednesday, June 10, 2015 - 22:28.

Introduction: Welcome to the Java tutorial on Multi-Dimensional Arrays. I would highly recommend you have a look at my Arrays page before reading through this one! What is a Multi-Dimensional Array? A Multi-Dimensional Array is an array which contains more than one index at any given placement. For example; instead of just having a value at the index "3", we could have "3""0", "3""1" etc. When are Multi-Dimensional Arrays Used? Compared to arrays there are not used as often. A good purpose for Multi-Dimensional Arrays is when you have sub-topics or values of main topics or values. So for example we could have some titles or books and games, like shown below (theory): (0 = Books, 1 = Games) [0][0] = "Book A" [0][1] = "Book B" [0][2] = "Book C" [1][0] = "Game A" [1][1] = "Game B" [1][2] = "Game C" Examples: Here are some code samples to help you understand:

String[][] myArray = new String[10][10];
myArray[0][0] = "Book A";
myArray[0][1] = "Book B";
myArray[0][2] = "Book C";
myArray[1][0] = "Game A";
myArray[1][1] = "Game B";
myArray[1][2] = "Game C";
System.out.println(myArray[0][2]);
System.out.println(myArray[1][1]);
String[][] presetArray = {{"Book A", "Book B", "Book C"}, {"Game A", "Game B", "Game C"}};
System.out.println(presetArray[1][2]);

The above code outputs the following...


Book C
Game B
Game C

Finished!

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