Write about Two dimensional array in Java?

Two dimensional array:

There will be situations where a table of values will have to be stored.

Java allows us to define such tables of items by using two dimensional arrays.

Eg; V[4][3];

Two dimensional arrays are stored an memory as follows:

As with the single dimensional arrays, each dimension of the array is indexed from zero to its maximum size minus one, the first index selects the row and the second index selects the column within that row.

2d array


For using two–dimensional arrays, we must follow the same steps as that of simple arrays. We may create a two–dimensional array like this:

int myArray [ ] [ ];

myarray=new int[3][4];

(or)

int myArray [ ] [ ]=new int [3][4];

This creates a tables that can store 12 integer values, four across and three down.

Like the one–dimensional arrays, two dimensional arrays may be initialized by following their declaration with a list of initial values enclosed in braces. For example

int table [2][3]={0, 0, 0, 1, 1, 1};

initializes the elements of the first row to zero and the second row to one. The initialization is done row by row. The above statements can be equivalently written as

int table [ ] [ ]={{0, 0, 0}, {1, 1, 1}};

by surrounding the elements of each row by braces. We can also initialize a two dimensional array in  the form of a matrix as shown below.

int table [ ] [ ]={
                       {0, 0, 0},
                       {1, 1, 1}
                       };

We can type to a value stored in a two–dimensional array by using subscripts for both the column and row of the corresponding element. Example

int value=table[1][2];

the retrieves the value stored in the second row and third column of table matrix
a quick way to initialize a two–dimensional array is to use nested for loops as shown below:

for(i=0; i < 5; i ++)
{
for(j=0; j < 5; j ++)
{
if(i==j)
table[i][j]=1;
else
table [i][j]=0;
}
}

This will set all the diagonal elements to 1 and others to zero an given below.

1          0          0          0          0
0          1          0          0          0
0          0          1          0          0
0          0          0          1          0
0          0          0          0          1

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