JAVA EXAMPLE PROGRAMS

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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When to use LinkedList or ArrayList?

Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.

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About Author

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.