How do I implement jagged arrays in Java?

How do I implement jagged arrays in Java?

To implement jagged arrays in Java, you can create an array of arrays with different lengths. Here's an example:

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

This creates a jagged array with 3 rows of different lengths.

Can you show me how to initialize it with values?

Sure! You can initialize a jagged array like this:

int[][] jaggedArray = {  
    {1, 2},  
    {3, 4, 5},  
    {6}
};

This sets the first row with 2 elements, the second with 3, and the third with 1.

How do I access elements in a jagged array?

You can access elements using the row and column indices. For example:

int value = jaggedArray[1][2]; // This accesses the third element of the second row.

Make sure to check the length of the row to avoid ArrayIndexOutOfBoundsException.

What are the advantages of using jagged arrays?

Jagged arrays are memory efficient as they allow you to create arrays of varying lengths, which can save space when not all rows need to be the same size.