Summation of elements of lower triangle of matrix

Example:
1 0 0
2 3 0
4 5 6
public class arraydemotriangleAsum {

static void triangleAsum(int x[][])
{
int i,j,c=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
if(i<=j)
{
c=c+x[i][j];
}
}
}
System.out.println("The Sum of triangle A is:"+c);
}
public static void main(String[] args)
{
triangleAsum(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}