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Java Multi-Dimensional Arrays

Multi dimensional arrays are arrays of arrays. To declare a multi dimensional array variable, specify each additional index using another set of square brackets. An example is given below for two dimensional array:

int sample[][] = new int[3][3];

We can specify memory for first dimension first, and we can assign memory for second dimension later as given below:

int sample[][] = new int[3][];
int sample[0] = new int[2];
int sample[1] = new int[2];
int sample[2] = new int[2];

The advantage of assigning memory for second dimension is your second dimension can be of any lengths, cannot be fixed length.

Other Java Array Examples

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Difference between while and do-while
The while statement verifies the condition before entering into the loop to see whether the next loop iteration should occur or not. The do-while statement executes the first iteration without checking the condition, it verifies the condition after finishing each iteration. The do-while statement will always execute the body of a loop at least once.
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I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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