Help with arrays and objects?

[fenixconnexion]

hey guys im a newb at java and i have a test tomorrow so any help would be greatly appreciated,
in a 2 dimensional array:

int [][]list = new int [5][4];
what would i use to find the length of the rows, the length of the colums, and how would i write a program to "pop" all the objects off? thanks!

[fenixconnexion]

ALSO:

this is a question in my book:

how much space in bytes would b required to store teh elements of the arrays created by the following declarations?

a) double [] a = new double [10]

how would i solve this?

thanks

[Reality Check]

Think of a 2-D array as an Array within an array, a checkerboard if you will. While an array is a bus, a 2-D array is a double decker.

Anyways, to get the length of the row you simply use the line: "arrayName.length"

To get the length of the array within each array you use: "arrayName [row].length"

Using this we can use a for loop within a for a loop and come up with this:

code:

for (int row = 0; row < arrayName.length; row += 1) {     for (int column = 0; column < arrayName [row].length; column +=1)        {             System.out.println (arrayName[row][column])         } }

[fenixconnexion]

^^^ thank you very much!!!