Print Star Pattern two vertical opposite triangle

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*

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print this pattern using only 3 loops, i used this method plz anyone can optimize this code.

public class Test {
    static int z =0;
    public void paten(int l)
    {

           for(int b=l; b<z ; b++)
            {
                System.out.print(" ");

            }
            for(int c=1; c<=(l*2)-1; c++)
            {
                System.out.print("*");
            }

    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int k = n/2 +1;
         z=k;
         int o=0;

        Test t = new Test();
        for(int i = n ; i>=1; i--){
            try{Thread.sleep(100);}
            catch(Exception e)
            {

            }
        if(k>1)
        {
            t.paten(k);
            System.out.println("");
            k--;
        }
        else if(k==1)
        {
            t.paten(k);
            System.out.println("");
            o=k+1;
            k--;

        }
        else{
            t.paten(o);
            System.out.println("");
            o++;
        }
        }

    }
}

print this pattern using only 3 loops, i used this method plz anyone can optimize this code. or tells me the best optimal solution of this using three loop and can reduce the number of lines of code.