The placement of logic is wrong that is why you are getting the error:
You should be using :
a = b;
b = c;
c = a + b;
public class Fibonacci
{
    public static void main(String[] args)
    {
        int a=0,b=1,c=0;
        System.out.print(a+" ");
        for(int i=1;i<10;i++)
        {
            a = b;
            b = c;
            c = a + b;
            System.out.print(" "+c);
        }
    }
}
Output:
0  1 1 2 3 5 8 13 21 34