Untitled

    public static void diamond(int n){
        for(int i = 1;i<=n;i++){
            for(int j = 1; j<=(n-i);j++){
                System.out.print(" ");
            }
            for(int j = 1;j<=(2*i)-1;j++){
                System.out.print("*");
            }
             System.out.println();
        }
        // inverted part
        for(int i = n; i>=1; i--){
            for(int j=1;j<=(n-i);j++){
                System.out.print(" ");
            }
            for(int j =1;j<=(2*i)-1;j++){
                System.out.print("*");
            }
            System.out.println();
        }
    }