Program will add but cannot get it to multiply

Hi,
Just started Java and want to multiply odd numbers between 1 and 100.
However, at the moment i can only get them to add. I tried replacing
the + sign with the * multiplication sign but to no avail. Any
suggestions?


int sum = 0;

for ( int number = 0; number <=100; number +=2 )
sum += number;


JOptionPane.showMessageDialog ( null, "The sum is " + sum, "Sum Odd
Integerts from 1 to 100", JOptionPane.INFORMATION_MESSAGE );

.

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