Diamond shape generator Java

DiamondNegative.java

package class1;

public class DiamondNegative {
    public static void main(String [] args){
        int sz = 11;
        int i,j,k,l,r;
        for (i=0; i<sz; i++) System.out.print("* ");
        System.out.println();
        for (i=0; i<sz-2; i++){
            k = 2*i+1;
            if (k > (sz-2))
                k = sz + sz - k - 4;
            l = sz/2-k/2;
            r = sz/2+k/2;
            for (j=0; j<sz; j++){
                if (j >= l && j <= r)
                    System.out.print("  ");
                else System.out.print("* ");
            }
            System.out.println();
        }
        for (i=0; i<sz; i++) System.out.print("* ");
    }
}