How sort 2 dimensional array in Java

Hi friends,

I need the full source code for sorting the 2 dimensional array

int student[][] = new int [100][2];

my input to the array is

1 200
2 900
3 400
4 500
5 300
6 100
........

and i need output in the descending order like

2 900
4 500
3 400
5 300
1 200
6 100

.................

please help me by giving full source code.

Thank you
hasan